| The Encyclopedia of Sexual Behavior: Vol II |
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| The Encyclopedia of Sexual Behavior: Vol. I |
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| Sex Research Institutes: The Institute for Sex Research |
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| Sex Research Institutes: The Hirschfeld Institute for Sexology |
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| Sex Hormones |
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| Artificial Insemination |
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| Sex Life in Europe |
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| Sex Reform Movement |
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| Eugenics |
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| Sex in Great Britain |
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| Sex Life of Scandinavian Countries: Denmark |
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| Jealousy |
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| Homosexuality |
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| Sex Life of Scandinavian Countries: Norway |
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