Naturally Selective - Robert King - Bog

Researchers of human behaviour have identified an `orgasm gap¿: Men usually orgasm during intercourse, whereas women often do not. The two leading explanations are either that women are ¿psychologically broken¿ - Freud¿s theory ¿ or badly designed ¿ the ¿by-product theory.¿ However, there is a more compelling third explanation.