A review by ali_str
Why Is Sex Fun?: The Evolution of Human Sexuality by Jared Diamond

3.0

It was a good wrap up on evolutionary aspects of human and other animals' sexuality. We are the odd ones among mammals and almost all animals when it comes to sexual traits, from the way children are born and cared for to burden of responsibility, bonding and marriage patterns and female menopause!
For quick take away: men can lactate and share the chore of feeding the children.