The subject of sex preoccupies us. It's the source of our most intense pleasures. Often it's
also the cause of misery, much of which arises from built-in conflicts between the evolved
roles of women and men.
This book is a speculative account of how human sexuality came to be the way it now is. Most of
us don't realize how unusual human sexual practices are, compared to those of all other living
animals. Scientists infer that the sex life of even our recent apelike ancestors was very
different from ours today. Some distinctive evolutionary forces must have operated on our
ancestors to make us different. What were those forces, and what really is so bizarre about us?