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A PURPOSE FOR SEX?
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abnormal adolescence adult aggressive animals associated Barr bodies become biological birds body breasts buggery cause cells certainly child chromosomes clitoris codes of criteria conception coprophilia copulation courtship cycle desire effect eggs embryo evolutionary example experience fact feel female feminine fertilization flatworm freemartin frotteurism gender genes genetic genitals girls happens hermaphrodite heterosexual homosexuality hormone human individual innate insects intercourse intersexuality involved kind Klinefelter's Syndrome known learned lives look lust murder male mammals mankind masculine masturbation mate mature mechanism menopause menstrual microbes mother nature no-one normal occur offspring organs orgasm ovary ovum pair parents parthenogenesis partner patterns penis perhaps person phenomenon physical pregnancy produce reproduction result Rhesus phenotype rotifers seems sense sex education sex organs sex-change sexual activity sexual behaviour society species sperm stimulation structure Syndrome term tissues trans-sexual transvestism transvestite vagina virgin birth whilst woman women X-chromosome young