This... theory of female promiscuity has been championed by the anthropologist Sarah Blaffer Hrdy. Hrdy has described herself as a feminist sociobiologist, and she may take a more than scientific interest in arguing that female primates tend to be "highly competitive... sexually assertive individuals." Then again, male Darwinian may get a certain thrill from saying males are built for lifelong sex-a-thons. Scientific theories spring from many sources. The only question in the end is whether they work.

Robert Wright, The Moral Animal