This book is a speculative account of how human sexuality came to be the way it now is.
Sex in social mammals is generally carried out in public, before the gazes of other members of the troop. - P2
Thus, sex is emphatically not just for fun and is rarely divorced from its function of fertilization. This generalization too admits exceptions: sex is flagrantly separated from reproduction in a few species, including bonobos (pygmy chimpanzees) and dolphins. - P3
By menopause is meant a complete cessation of fertility within a time span that is much briefer than the previous fertile career, and that is followed by an infertile life span of significant length. - P4
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