Why Is Sex Fun?: The Evolution of Human Sexuality

Why are humans one of the few species to have sex in private? Why do humans have sex any day of the month or year—including when the female is pregnant, beyond her reproductive years, or between her fertile cycles? Why are human females the only mammals to go through menopause? Why is the human penis so unnecessarily large? Why do we differ so radically in these and other important aspects of our sexuality from our closest animal relatives and ancestors?With wit and fascinating scientific expertise, the author of The Third Chimpanzee explores the mystifying evolutionary forces that gave shape to our sexual distinctions and shows how they contributed to what it means to be uniquely human.