| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| What nobody tells young people about sex | | 1934 | Justus D. Wilbur | |  | |  | |
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| What parents should teach their children | | 1912 | Sylvanus Stall | | | | | |    
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| "What to say" in telling the story of life's renewal to children | | 1914 | Mrs. Harriet Hickox Heller | | | | | |
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| What to tell your boy | | 1918 | John Eainsf, John. Rainsford | | | | | |
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| What you should tell your boy | | 1913 | Edmund Thomas | | | | | |
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| When a boy becomes a man: a little book for boys | Rev. | 1912 | Edward Bok, Harry Bisseker | | | |  | |
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| Why we die | | 1920 | Sidney C. (Sidney Calhoun) Tapp | | | | | |
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| Why we misbehave | | 1928 | Samuel Daniel Schmalhausen | | | | | |
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| Wie sage ich's meinem kinde?: ratschläge zur geschlechtlichen erziehung für haus und familie | | 1924 | Karl Wand |  | | | | |
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| Will it be a boy?: Sex-determination according to superstition and to science | | 1932 | Dr. F., Fridthjof Okland | | | | | |
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| William McGarvey and the open pulpit: an intimate history of a celibate movement in the Episcopal church and of its collapse, 1870-1908 | | 1935 | Edward Hawks | | | | | |
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| Wise parenthood: the treatise on birth control for married people | | 1932 | Arnold Bennett, Marie Carmichael Stopes | | | |  | |
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| Within the bud: procreation of a healthy, happy and beautiful child of the desired sex, a biological teaching of eugenics | | 1916 | Louis Dechmann | | | | | |
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| The woman a man marries: an analysis of her double standard | | 1927 | Victor Cox Pedersen | | | | | |
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| Woman: a treatise on the normal and pathological emotions of feminine love | 7th enl. and rev. ed. | 1912 | Bernard S. Talmey | | | | | |
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| Woman: a vindication | | 1923 | Anthony M. (Anthony Mario) Ludovici | | | | | |
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| Woman and love | | 1927 | Cedar Paul, Bernhard A. (Bernhard Adam) Bauer, E. S. Jerdan | | | | | |
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| Woman and the new race | | 1920 | Margaret Sanger, Havelock Ellis | | | | | |
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| Woman as a sexual criminal | | 1934 | Erich Wulffen, David Berger | | | | | |
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| Woman, her sex and love life | | 1917 | William J. (William Josephus) Robinson | | | | | |
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| The woman pays | | 1936 | Frank Leighton Wood | | | | | |
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| Woman's inside story | | 1948 | Mario Alberto Castallo, Cecilia L. Schulz | | | | | |
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| A woman's philosophy of love. | | 1893 | Caroline Fairfield Corbin | | | | | |
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| Woman's sex life | | 1935 | Bernarr Macfadden | | | | | |
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| Women and morality, by a mother. Men and morals, by a father. The sexes again | | 1914 | C. Grasquoine Hartley, " Catherine Gasquoine Hartley "Mrs. W. M. Gallichan Gallichan, Wallace de Groot Cecil Rice | | | | | |
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| Women as sex vendors | | 1918 | Roscoe Burdette Tobias, Mrs Mary Edna (Tobias) Marcy, Mary Marcy | | | | | |
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| Women | | 1919 | | | | | | |
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| Your key to romance: a frank approach to love for the young woman of today | | 1948 | Harold Morrow Sherman | | | | | |
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| Youth and chastity | | 1934 | Dr. Tihamer Toth, Tihamér Tóth, Stephen Chapkovich | | | | | |
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| Youth and its problems: the sex life of a man | | 1919 | Winfield Scott Hall | | | | | |
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| Youth and sex | | 1933 | Meyrick Booth | | | | | |
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| Youth's tragedies avoided | | 1933 | Frederick Eiche | | | | | |
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| Zeitehe | | 1928 | Charlotte Homeyer | | | | | |
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| Zum Sinn und Wesen der Geschlechter | | 1925 | Erich W. J. Meyer | | | | | |
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Public Domain Books