Why Is Sex Fun?: The Evolution of Human Sexuality

Why do we differ so radically in these and other important aspects of our sexuality from our closest ancestor, the apes? Why does the human female, virtually alone among mammals, go through menopause? Why does the human male stand out as one of the few mammals to stay with the female he impregnates, to help raise the children that he sired? Why is the human penis so unnecessarily large? Why Is Sex Fun? shows how our sexuality, as much as our large brains or upright posture, led to human' rise in the animal kingdom.