| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| Hygiene des geschlechtslebens | 8., verm. und verb. aufl. | 1915 | Max von Gruber |  |  | | | |
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| Hygiene des geschlechtslebens | 6. u. 7., verm. u. verb. aufl. | 1914 | Max von Gruber | | | | | |
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| Hygiene des geschlechtslebens | 5. verm. und verb. aufl. | 1912 | Max von Gruber | | | | | |
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| The hygiene of marriage: a detailed consideration of sex and marriage | | 1932 | T. V. Smith, Millard S. (Millard Spencer) Everett, Clara M. Davis | |  | | | |
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| The hygiene of marriage: a detailed consideration of sex and marriage | | 1932 | T. V. Smith, Millard S. (Millard Spencer) Everett, Clara M. Davis | | | | | |
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| Hygiene of sex | | 1926 | Max, Max von Gruber | | | |  | |
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| Hygiene of sex | | 1926 | Max, Max von Gruber | | | | | |
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| The hygiene of the home, and responsibility for sex education | | 1926 | John J. (John James) Mullowney | | | | | |
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| I commit to your intelligence: a constructive guide to young people concerning sex and religion | | 1936 | Reginald Churchill | | | | | |
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| I. Human constitution, its significance in medicine and how it may be studied: II | | 1928 | George Draper | | | | | |
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| Ideal marriage: its physiology and technique | | 1930 | Theodoor H. van de (Theodoor Hendrik) Velde, Th. H., J. Johnston Abraham | | | | | |    
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| The ideal of a home [by] Earle Bennett Cross | | 1934 | Earle Bennett Cross | | | | | |
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| Impotence and sterility: with aberrations of the sexual function and sex-gland implantation | | 1917 | G. Frank (George Frank) Lydston | | | | | |
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| Impotence in the male: the psychic disorders of sexual function in the male | | 1927 | Wilhelm Stekel, Oswald Herman Boltz | | | | | |
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| Impotency, sterility, and artificial impregnation | | 1917 | Frank P., Franklyn Pierre Davis | | | | | |
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| The impuritans: a glimpse of that new world whose Pilgrim fathers are Otto Weininger, Havelock Ellis, James Branch Cabell, Marcel Proust, James Joyce, H. L. Mencken, D. H. Lawrence, Sherwood Anderson, et id genus omne | | 1929 | Harvey Wickham, Harvey Wickman | | | | | |
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| Innocence and ignorance | | 1917 | père Martin Stanislas Gillet, J. Elliot (John Elliot) Ross | | | | | |
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| ... Instead of "wild oats" | | 1912 | Edward Bok, Winfield Scott Hall | | | |  | |
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| The intelligent man's guide to marriage and celibacy | | 1929 | pseud Juanita Tanner | | | | | |
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| The intimate life of the individual, the family, society and the race: plain talks to parents and to young people establishing a home | | 1926 | Winfield Scott Hall | | | | | |
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| The intimate side of a woman's life | | 1937 | Mrs Leona W. Chalmers, TTinfield Scott Pugh, Frank H. Netter | | | |  | |
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| An introduction to gynecological exfoliative cytology: a manual for cytotechnicians | | 1959 | Winifred Liu | | | | | |
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| An introduction to sex education | | 1934 | Winifred V. (Winifred Vanderbilt) Richmond | | | | | |
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| An introduction to the study of the oestrous cycle in the dog | | 1931 | Herbert M. (Herbert McLean) Evans, H. H. (Harold Harrison) Cole | | | | | |
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| Is it a boy?: Sex-determination according to superstition and to science | | 1932 | Fridthjof Johannes Økland | | | | | |
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| Jeg--du--vi; streiflys over den ekteskapelige samlivskrise | | 1936 | Britta Berner |  | | | | |
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| Körperliche und seelische liebe | | 1924 | Samuel Jessner | | | | | |
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| Keeping in condition: a handbook on training for older boys | | 1919 | Clark W. Hethcrington, Harry H. (Harry Hascall) Moore | | | | | |
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| Keeping in condition: a handbook on training for older boys | | 1919 | Clark W. Hetherington, Harry H. (Harry Hascall) Moore | | | | | |
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| Keeping in condition: a handbook on training for older boys | | 1915 | Clark AV. Hetherington, Harry H. (Harry Hascall) Moore | | | | | |
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| L'amour et la magie | | 1926 | |  | | | | |
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| L'amour et la morale | | 1925 | Jacques Fischer | | | | | |
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| L'amour moderne: cinq balles dans la peau | | 1932 | Pierre de. Trévières | | | | | |
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| L'amour qui n'ose pase dire son nom | | 1927 | François Porché | | | | | |
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| ...L'enigme de la femme. | | 1931 | Pierre Vachet | | | | | |
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| L'église et l'éducation sexuelle | | 1929 | | | | | | |
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| L'individu et le sexe: psychologie du narcissisme | | 1927 | Angelo Louis Marie Hesnard | | | | | |
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| L'inquiétude sexuelle | | 1927 | Pierre Vachet |  | | | | |
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| La beauté et l'instinct sexuel | | 1922 | Charles Lalo | | | | | |
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| La formation de l'être: histoire des idées sur la génération | | 1930 | Jean Rostand | | | | | |
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| La limitation des naissances: birth control | | 1931 | Raoul de. Guchteneere |  | | | | |
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| La psychologie du vice | | 1934 | Pierre Vachet | | | | | |
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| La race future | | 1924 | André. Montfort | | | | | |
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| La science et l'amour | | 1935 | Magnus Hirschfeld | | | | | |
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| Lawful birth control: according to nature's law, in harmony with Catholic morality | | 1935 | Henry Schmitz, John A. (John Anthony) O'Brien, Raoul de. Guchteneere | | | | | |
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| Laws of life | | 1936 | Halliday Sutherland | | | | | |
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| The laws of sex | | 1921 | Edith Houghton Hooker | | | | | |
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| Le combat de la pureté | | 1931 | Georges Hoornaert | | | | | |
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| Le couple futur | | 1912 | Jules Bois | | | | | |
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| Le couple humain dans l'œuvre de Thomas Hardy | | 1928 | Pierre d'. Exideuil | | | | | |
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| Le couple nu: roman nuptial | | 1931 | Adrien Le Corbeau | | | | | |
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| Le monde moderne et le mariage chrétien | | 1935 | Benoît Lavaud | | | | | |
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| Le Néo-Malthusisme: Est-il Moral? | | 1910 | | | | | | |
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| Les fonctions sexuelles mâles et leurs troubles | | 1932 | Stanislas Higier | | | | | |
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| Les problèmes de l'hérédité et du sexe | | 1933 | Jean Rostand | | | | | |
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| Les problèmes de la sexualité | | 1913 | | | | | | |
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| Les transformations sociales des sentiments | | 1920 | Frédéric Paulhan | | | | | |
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| Letters to a young man on love and health | | 1920 | Walter Matthew Gallichan | | | | | |
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| Libido sexualis: studies in the psychosexual laws of love verified by clinical sexual case histories | | 1933 | Albert Moll, David Berger | | | | | |
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| Lichtstrahlen für die gesundheit | | 1926 | James Lawrence Nichols, Benjamin Grant Jefferis | | | | | |
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| Liebesmittel: eine darstelling der goschlechtlichen reizmittel <aphrodisiaca> | | 1930 | Magnus Hirschfeld, Richard Linsert | | | | | |
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| Life in the making | | 1933 | Alan F. (Alan Frank) Guttmacher, Rosa Rosenthal Kohn | | | | | |
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| Life must go on | | 1934 | Voice of experience, Arthur Wilson Tarbell | | | | | |
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| Life's beginnings for boys of ten to fourteen years | | 1912 | Winfield Scott Hall | | | | | |
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| Little essays of love and virtue | | 1922 | Havelock Ellis | | | | | |
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| Little journeys into the heart of true things | | 1920 | Marie A. Greene | | | | | |
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| Lives of fair and gallant ladies | | 1922 | seigneur de Pierre de Bourdeille Brantôme, A. R. (Alfred Richard) Allinson | | | | | |
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| Lives of fair & gallant ladies | | 1933 | seigneur de Pierre de Bourdeille Brantôme, Alfred Richard Allinson, Majeska | | | | | |
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| Love: a treatise on the science of sex-attraction | | 1933 | Bernard Simon Talmey | | | | | |
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| Love; a treatise on the science of sex-attraction: for the use of physicians and students of medical jurisprudence | 3d rev. ed. | 1919 | Bernard Simon Talmey | | | | | |
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| Love: a treatise on the science of sex-attraction | 2d rev. ed. | 1916 | Bernard S. Talmey | | | | | |
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| Love and ethics | | 1911 | Ellen Key | | | | | |
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| Love and ethics | | 1912 | Ellen Key, Mamah Bouton Borthwick, Frank Lloyd Wright | | | | | |
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| Love and life: sex urge and its consequences | | 1928 | Don Cabot McCowan | | | | | |
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| Love and marriage | | 1929 | Winfield Scott Hall | | | | | |
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| Love and marriage: foundations of social health | | 1937 | Maurice A. (Maurice Alpheus) Bigelow, Thomas Walton Galloway, Frank D. Moore | | | | | |
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| Love and morality: an attempt at a physiological interpretation of human thought | | 1927 | Catherine Alison Phillips, Jacques Fischer | | | | | |
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| Love and sex | | 1922 | William Allan Brooks | | | | | |
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| Love and the sex emotions: their individual and social aspects | | 1932 | William J. (William John) Fielding | | | | | |
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| Love in the future | | 1929 | William J. (William Josephus) Robinson, Eli Frank Stephenson | | | | | |
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| Love in the machine age: a psychological study of the transition from patriarchal society | | 1930 | Floyd Dell | | | | | |
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| Love is a challenge | | 1936 | Florence Guy. Seabury | | | | | |
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| Love or marriage?: A frank, honest and logical review of past, present and future psychological and physical conditions relating to an ever present and particularly fascinating subject | | 1915 | John. Rouge | | | | | |
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| Love's coming of age: a series of papers on the relations of the sexes | | 1911 | Edward Carpenter | | | | | |
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| Love-life in nature: the story of the evolution of love | | 1926 | Wilhelm Bölsche, Cyril Brown | | | | | |
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| Magia sexualis | | 1931 | Paschal Beverly Randolph, Mariíà Naglovskaíà | | | | | |
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| The making of a man: the physiology and hygiene of sex for high school boys, thier parents and teachers | | 1914 | Oliver Edward Janney, J. F. Didusch | | | | | |
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| The man a woman marries: problems in consideration | | 1929 | Victor Cox Pedersen | | | | | |
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| The man and the 20th century problems: vital teaching for progressive men on manhood, mind power and efficiency | | 1914 | Newton N. Eiddell, Newton N. Riddell | | | | | |
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| Man and woman: a study of secondary and tertiary sexual characters | | 1929 | Havelock Ellis | | | | | |
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| Man's sex life | | 1935 | Bernarr Macfadden | | | | | |
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| Man's unconscious passion | | 1920 | Wilfrid Lay | | | | | |
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| Manhood and marriage | | 1916 | Bernarr Macfadden | | | | | |
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| A manual of sex hygiene | | 1913 | Jeannette Winter Hall, Winfield Scott Hall | | | | | |
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| The manual on certain phases of health and marital happiness | | 1933 | Forrest Eugene Dowey | | | | | |
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| The Marquis and the Chevalier | [1st American ed.] | 1952 | James Cleugh | | | | | |
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| Marquis de Sade's anthropologia sexualis of 600 perversions, 120 days of Sodom; or, The school for libertinage; and the sex life of the French age of debauchery: from private archives of the French government | | 1934 | Anthropological, Iwan Bloch, Raymond Sabatier | | | | | |
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| Marriage and morals | | 1929 | Bertrand Russell | | | | | |
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| Marriage and the family: a text for moderns | | 1956 | Lucius Ferdinand Cervantes, Carle Clark Zimmerman | | | | | |
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| Marriage and the sex-problem | | 1936 | Dr. F. W. Foerster, Friedrich Wilhelm Foerster, Fulton J. (Fulton John) Sheen | | | | | |
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| Marriage, morals, and medical ethics | | 1951 | Frederick L. Good, Otis F. Kelly | | | | | |
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| Marriage | | 1933 | Ernest Rutherford Groves | | | | | |
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| Married life: a family handbook | | 1925 | Reinhold Willman | | | | | |
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| Married life: a family handbook | | 1927 | Reinhold Willman | | | | | |
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| Married life: a family handbook | | 1936 | Reinhold Willman | | | | | |
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| Married life: a family handbook | | 1917 | Reinhold Willman | | | | | |
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| Married priests in the Catholic church | | 1934 | George Perhac | | | | | |
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| Married sweethearts: the rôle of sex behavior of marriage | | 1933 | Charles Alexander Clinton | | | | | |
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| The married woman: a practical guide to happy marriage | | 1936 | Gladys Hoagland Groves, Robert Alexander Ross | | | | | |
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| The master key of love and the psychology of human behaviour: including the psychology and philosophy of human relations | | 1932 | Harry O. Saxon | | | | | |
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| The master key to love: the psychology of human behaviour | | 1925 | Harry O. Saxon | | | | | |
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| The mastery of sex through psychology and religion | | 1932 | Leslie Dixon Weatherhead, J. R. Rees, Marion Greaves | | | | | |
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| The meaning and varieties of love: a psychological analysis and interpretation | | 1935 | James Winfred Bridges | | | | | |
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| Mechanisms concerned with conception: proceedings of a symposium prepared under the auspices of the Population Council and the Planned Parenthood Federation of America | | 1963 | Carl Gottfried Hartmann | | | | | |
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| Medical help on birth control | | 1928 | Walter Henry Maxwell Telling, M. Beddow Bayly | | | | | |
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| The medical, social, economic, moral, and religious aspects of birth control | | 1926 | S. Adolphus (Sigard Adolphus) Knopf | | | | | |
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| Men against women: a study of sexual relations | | 1934 | Theodore Besterman | | | | | |
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| Modern birth control | | 1961 | Robert Mallory, Theodore D. Irwin | | | | | |
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| Modern eugenics for men and women: a complete medical guide to a thorough understanding of the principles of health and sex relations | | 1928 | Mrs Mary (Reis) Melendy, Marc Henry Frank | | | | | |
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| A modern messenger of purity: sermons concerning the sixth commandment, delivered at the Eastern shrine of the Little Flower | | 1932 | Albert H. (Albert Harold) Dolan | | | | | |
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| The modern method of birth control | | 1935 | Thurston Scott Welton | | | | | |
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| Modern sex techniques | | 1959 | Robert Street, Harry Toombs | | | | | |
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| Modern woman and sex: a feminist physician speaks | | 1933 | Rachelle Skidelski Yarros | | | | | |
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| Modern youth and marriage | | 1928 | Henry Neumann | | | | | |
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| Moral adventure (Reprinted from the book Adventure) | | 1929 | John Rhode, Burnett Hillman Streeter | | | | | |
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| The morality of birth control | | 1925 | Ettie A. Rout, Ettie A. Rout. Hornibrook | | | | | |
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| Morals and marriage; the Catholic background to sex | | 1936 | Thomas Gilby | | | | | |
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| Motherhood; a practical guide for the newly married: including determination of sex, intercourse during pregnancy, and prenatal influence | | 1921 | Harland William Long | | | | | |
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| Motherhood and its enemies | | 1927 | Charlotte Franken Haldane | | | | | |
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| Motherhood and its enemies | | 1928 | Charlotte Franken Haldane | | | | | |
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| Motherhood in bondage | | 1928 | Margaret Sanger | | | | | |
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| Movies, delinquency, and crime | | 1933 | Herbert Blumer, Philip Morris Hauser | | | | | |
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| My skirmish with jolly Roger | | 1929 | D. H. (David Herbert) Lawrence | | | | | |
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| The mystery of sex and race regeneration: a sane, sensible and reasonable approach to the ... problem of sex from the natural, moral and religious aspects and having the regeneration of the race in view | [4th ed.] | 1950 | R. Swinburne (Reuben Swinburne) Clymer | | | | | |
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| The naked truth about sex | | 1935 | Joseph Vaughan Wynn | | | | | |
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| Natural birth control | | 1935 | Dr. W. Ostrowsky, William Ostrowsky | | | | | |
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| The natural philosophy of love | | 1922 | Remy de Gourmont, Ezra Pound, Remy | | | | | |
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| The natural philosophy of love | | 1932 | Remy de Gourmont, Burton Rascoe, Ezra Pound | | | | | |
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| Nature's law of birth control | | 1926 | Mrs. Monteith Erskine, James Monteith Erskine, "Mrs. Monteith Erskine." Cicely Quicke Erskine | | | | | |
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| Nature's urge to propagate | | 1934 | Jan. Van De Graaff | | | | | |
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| Nature's way: the fertile and sterile periods of marriage | | 1934 | Victor Cox Pedersen | | | | | |
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| The new chivalry: the statement of a movement among men and young men in the defense of home and country | | 1914 | Henry E. (Henry Ezekiel) Jackson | | | | | |
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| New patterns in sex teaching: the normal sex interests of children and their guidance from infancy to adolescence | | 1934 | Frances Bruce Strain | | | | | |
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| The new tocology: the science of sex and life | | 1921 | Joseph H. Greer, Eli F. Brown | | | | | |
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| The new tocology: the science of sex and life | | 1911 | Joseph H. Greer, Eli F. Brown, Euth Blake | | | | | |
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| Nightwood | | 1936 | Djuna Barnes | | | | | |
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| Nightwood | | 1937 | Djuna Barnes, T. S. (Thomas Stearns) Eliot | | | | | |
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| The nobility of boyhood | | 1910 | Robert N. (Robert Newton) Willson | | | | | |
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| A notebook of intimate problems | | 1934 | Marion Sayle Taylor | | | | | |
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| Odoratus sexualis | | 1933 | Iwan Bloch | | | | | |
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| Oestrus, receptivity, and mating in chimpanzee | | 1936 | James Harlan Elder, Robert Mearns Yerkes | | | | | |
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| The old love and the new: divorce and readjustment | | 1930 | Willard Walter Waller | | | | | |
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| On the way to the sanctuary: a treatise on vocational purity for minor and major seminarists | | 1935 | Father Fulgence Meyer | | | | | |
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| The origin of life: a girl's physiology | | 1913 | Grace Frances Ellis | | | | | |
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| The origin of life and the evolution of living things: an environmental theory | | 1952 | Olan R. Hyndman | | | | | |
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| The origin of the human race | | 1939 | Merton Stark Yewdale | | | | | |
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| Our changing human nature | | 1929 | Samuel Daniel Schmalhausen | | | | | |
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| Our sons | 1st. ed. | 1914 | William Lund. Clark, Winfield Scott Hall | | | | | |
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| Out for character: twenty-six articles | | 1922 | | | | | | |
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| Přítel čili nepřítel?: mužstvu v armádĕ a u námořnictva | | 1918 | Max Joseph Exner | | | | | |
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| Para echar luz en la obscuridad de la ciencia sexual: un consejero indispensable y guia para llevar la generacion contemporanea a la virilidad, dar consejos a la virgen, esposa | | 1920 | J. L. Nichols, J. H. T. Stempel, Octavio Soto | | | | | |
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| Parenthood: design or accident?: A manual of birth control | | 1935 | H. G. (Herbert George) Wells, Michael Fielding, pseud. Micheal Fielding | | | | | |
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| Parents and sex education: for parents of young children | | 1928 | Benjamin C. (Benjamin Charles) Gruenberg | | | | | |
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| Parents and sex education: for parents of young children | | 1932 | Benjamin C. (Benjamin Charles) Gruenberg | | | | | |
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| Parents, children, and the facts of life: a text on sex education for Christian parents and for those concerned with helping parents | | 1952 | Henry V. Sattler | | | | | |
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| The parents' guide | | 1917 | John W. Collins, Emma F. Angell (Emma Frances Angell) Drake, Ozora Stearns Davis | | | | | |
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| The part of the church in social hygiene: an appeal for sex education with a religious spirit | | 1926 | Thomas Walton Galloway | | | | | |
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| Patarimai moterims ir merginoms apie lyties dalykus autoriui leidus verte J. Barkus: Su paveikslais | | 1921 | J. Barkus, William J. (William Josephus) Robinson | | | | | |
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| Patarimai vyrams apie lyties dalykus: su pamokinimais, kaip aiškinti vaikams lyties apsireiškimus, autoriui leidus vertē pranašas. Su paveikslais | | 1919 | William J. (William Josephus) Robinson | | | | | |
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| The pathway to world peace | | 1934 | Yancey, William Taylor Elmore, William Paul. Yancey | | | | | |
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| Perfect boyhood: A perfect boy makes a perfect man | | 1911 | Thomas Washington Shannon | | | | | |
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| Perfect girlhood; vital information for young girls | | 1913 | Thomas Washington Shannon | | | | | |
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| The perfect man | | 1918 | William James Heaps | | | | | |
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| Perfect manhood; how inherited, attained and maintained | | 1907 | Thomas Washington Shannon | | | | | |
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| Personal and social purity from a physician's standpoint: a brief treatise on selfial and social purity, sexual hygiene, venereal diseases and marriage; together with a plea for public instruction in these subjects; a life book | | 1907 | Jerome Daniel Dodge | | | | | |
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| Personal beauty and racial betterment | | 1920 | Knight Dunlap | | | | | |
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| Personal help for boys | | 1918 | Richard W. Lewis, Thomas Washington Shannon | | | | | |
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| Personal help for boys: a book of gripping interest to active, ambitious boys, furnishing fun, instruction and entertainment, and pointing out how to attain the strong body, mind and character that fit a boy to take a man's part in the world; including many vital subjects of interest on which he wants more knowledge, together with such counsel and help as will better enable him to understand himself during the puzzling transition from boyhood to manhood | | 1921 | T. W. (Thomas Washington) Shannon, Louise Francis Spaller | | | | | |
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| Personal help for girls | | 1918 | Mrs. Louise Francis Spaller, Thomas Washington Shannon | | | | | |
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| Personal help for parents, knowledge for parents, including vital talk to fathers and a talk to mothers about the responsibilities of parenthood and a specific and comprehensive guide for the instruction of children in the delicate matters of sex | | 1918 | Emory Adams Allen, Thomas Washington Shannon | | | | | |
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| Personal help for the married: a volume of vital facts for all married and marriagebale men and women | | 1918 | W. J. (William John) Truitt, Thomas Washington Shannon | | | | | |
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| Personal help for young women: vital help for young women, married or single, designed to help them in their truest physical, mental and moral development through a chaste, scientific and practical knowledge of themselves | | 1918 | Mrs. Louise Francis Spaller, Thomas Washington Shannon | | | | | |
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| Personal reply | | 1943 | Marie Manning | | | | | |
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| Personality adjustment and domestic discord | | 1935 | Harriet R. (Harriet Rosenthal) Mowrer | | | | | |
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| Personality and conduct | | 1918 | Maurice Parmelee | | | | | |
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| Physical and emotional aspects of marriage | | 1953 | Carl Leonard Anderson | | | | | |
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| The physiology of love | | 1929 | George M. Katsainos | | | | | |
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| Pictorial history of morals | | 1963 | Harry E. Wedeck | | | | | |
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| Picture Stories of the Sex Life of Man and Woman | | 1941 | David H. (David Henry) Keller | | | | | |
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| Pitfalls of marriage | | 1926 | Walter M. Gallichan | | | | | |
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| Pius XI on Christian marriage; the English translation. | | 1931 | | | | | | |
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| The pivot of civilization | | 1922 | Margaret Sanger | | | | | |
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| Plain facts | | 1917 | John Harvey Kellogg | | | | | |
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| Plain facts about a great evil | | 1913 | Dame Christabel Pankhurst | | | | | |
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| Plain facts about a great evil | | 1913 | Dame Christabel Pankhurst | | | | | |
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| Plain talks on avoided subjects | Rev. ed. | 1915 | Henry N. (Henry Newell) Guernsey | | | | | |
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| Planning your family | | 1948 | Herbert C. Yahraes | | | | | |
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| A plea for the younger generation: an intimate talk on the vital question of telling the truth to children from an altogether human and utterly unscientific point of view | | 1913 | Cosmo Hamilton | | | | | |
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| Poetica erotica: a collection of rare and curious amatory verse | | 1921 | Thomas Robert Smith | | | | | |
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| Poetica erotica: a collection of rare and curious amatory verse | | 1927 | T. R. (Thomas Robert) Smith | | | | | |
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| The poison of prudery: an historical survey | | 1929 | Walter Matthew Gallichan | | | | | |
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| The pope and Christian marriage | | 1933 | Otto Cohausz, George Duncan Smith | | | | | |
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| Population pressure: war and poverty | | 1945 | Helen R. Hinman, William I. Battin | | | | | |
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| Pour les vignt ans de Colette | | 1935 | | | | | | |
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| The power of sex | | 1953 | Frank Samuel Caprio | | | | | |
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| The Power of Sexual Surrender | | 1962 | Marie Nyswander Robinson | | | | | |
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| The power of sexual surrender | [1st ed.] | 1959 | Marie Nyswander Robinson | | | | | |
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| The power to love: a psychic and physiologic study of regeneration | | 1934 | Edwin Walter Hirsch | | | | | |
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| Préjugé et problème des sexes | | 1912 | Jean Finot | | | | | |
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| A practical treatise on disorders of the sexual function in the male and female | 2d ed. | 1922 | Max, Max Huhner | | | | | |
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| A practical treatise on disorders of the sexual function in the male and female | | 1929 | Max Huhner | | | | | |
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| A practical treatise on disorders of the sexual function in the male and female | | 1916 | Max Huhner | | | | | |
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| Preparation for marriage | | 1932 | Kenneth Macfarlane Walker | | | | | |
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| Private lessons in the cultivation of magnetism of the sexes: teaching the development and wonderful enlargement of those powers and influences that nature has invented to aid every human life | | 1934 | Edmund Shaftesbury | | | | | |
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| Private lessons in the cultivation of magnetism of the sexes: teaching the development and wonderful enlargement of those powers and influences that nature has invented to aid every human life | | 1924 | Edmund Shaftesbury | | | | | |
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| Private sex lessons | | 1916 | David H. Reeder | | | | | |
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| The problem of purity | | 1928 | Violet Mary. Firth | | | | | |
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| Probleme unserer Zeit | | 1928 | Robert Heymann | | | | | |
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| Problems and principles of sex education: a study of 948 college men | | 1915 | Max Joseph Exner | | | | | |
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| Problems of human reproduction | | 1926 | Paul Bowman Popenoe | | | | | |
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| Problems of the sexes | | 1913 | Mary J. SafTord, Mary Joanna Stafford, Jean Finot | | | | | |
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| Prostitution in the modern world: a survey and a challenge | | 1936 | Gladys Mary. Hall | | | | | |
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| Psychoanalysis and love | | 1922 | André Tridon | | | | | |
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| Psychoanalysis of Freud and Adler | | 1922 | F. C. Sumner, Francis C. Sumner | | | | | |
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| The psychological effects of menstruation | | 1932 | Mary. Chadwick | | | | | |
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| Psychologie der frau: versuch einer synthetischen, sexualpsychologischen entwickelungslehre | | 1922 | Wilhelm Liepmann | | | | | |
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| Psychology, evolution, and sex | | 1956 | Cecil P. (Cecil Percy) Martin | | | | | |
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| The psychology of marriage | | 1918 | Walter Matthew Gallichan | | | | | |
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| The psychology of marriage | | 1918 | Walter M. Gallichan | | | | | |
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| Psychology of sex: a manual for students | | 1933 | Havelock Ellis | | | | | |
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| Psychology of the unconscious: a study of the transformations and symbolisms of the libido, a contribution to the history of the evolution of thought | | 1916 | Beatrice M. Hinkle, Mrs. Beatrice Moses Hinkle, C. G. (Carl Gustav) Jung | | | | | |
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| Psychology of the unconscious: a study of the transformations and symbolisms of the libido : a contribution to the history of the evolution of thought | | 1916 | Beatrice M. Hinkle, C. G. (Carl Gustav) Jung | | | | | |
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| Psychotherapie und kastration: die bedeutung der psychotherapie als erziehungs- und ausscheidungsmethode für sexuell abwegige und sittlichkeitsverbrecher, dargestellt an fällen aus der kriminalpraxis, unter heranziehung der graphologie als hilfswissenschaft; mit einführung in das sterilisations- und kastrationsrecht, sowie in fragen der vorbeugung gegen das verbrechen, mit ausblick auf fragen der gesetzgebung und strafrechtspflege | | 1935 | Martin Staemmler, Emil Lange, Fritz Ziegler | | | | | |
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| Purity, birth and sexual problems for mothers | | 1908 | Florence Evans | | | | | |
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| Quel che gli amanti ignorano | | 1929 | Alfonso Abruzzo | | | | | |
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| Quel che il giovane marito deve sapere | | 1914 | Mario Nesi, Sylvanus Stall |  | | | | |
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| Quel che il giovanotto deve sapere | | 1913 | Mario Nesi, Sylvanus Stall | | | | | |
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| Quel che il ragazzo deve sapere | | 1913 | Ernesto Codignola, Sylvanus Stall | | | | | |
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| Quel che la fanciulla deve apere | | 1913 | Lina Caico, Mary Wood-Allen | | | | | |
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| Quel che la giovane deve sapere | | 1912 | Mario Nesi, Mary Wood-Allen | | | | | |
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| Race regeneration, the mystery of sex: a course of instruction on the right use of sex | [2d ed.] | 1921 | R. Swinburne (Reuben Swinburne) Clymer | | | | | |
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| Rational sex ethics: a physiological and psychological study of the sex lives of normal men and women with suggestions for a rational sex hygiene, together with further investigations | | 1920 | Walter Franklin Robie | | | | | |
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| Rational sex ethics: a physiological and psychological study of the sexlives of normal men and women, with suggestions for a rational sex hygiene | | 1916 | Walter Franklin Robie | | | | | |
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| Rational sex ethics, for men in the army & navy | | 1918 | Walter Franklin Robie | | | | | |
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| Rational sex ethics, further investigations: a more intensive study of sex histories, case histories, and dreams with therapeutic suggestions, and philosophical deductions | | 1919 | W. F. (Walter Franklin) Robie | | | | | |
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| The rational sex life for men | | 1914 | Max Joseph Exner | | | | | |
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| Regeneration through woman and the problem of maternity | | 1919 | James Hegyessy | | | | | |
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| Regenerative power: or, Vital rejuvenation | | 1922 | William Walker Atkinson, Edward E. Beals | | | | | |
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| Reine lebensführung | | 1925 | Otto Hauser | | | | | |
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| Religion and lust: or, The psychical correlation of religious emotion and sexual desire | 3d ed., rev. and enl., with additional notes. | 1905 | James Weir, Jr James Weir | | | | | |
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Public Domain Books