Occasionally a book comes along that changes you in a profound way. It's partly the book, partly you, and partly where you are in your life when you read it. For me, this was one of those books.
Robert Wright ranges all over. Sex, marriage, monogomy, families, kin bonding and support, social hierarchy and status, reciprocal altruism, and modern morality. If you are interested in the nature of human behaviour and morality, and what modern genetics has to say about it, this book will tell you.
The author doesn't preach. He's very aware that this is a young science and much of what he discusses is speculation. This makes the book stronger: much of it is questions to ponder, not 'truths' to be believed. Open minded rather than didactic.
He also thoroughly debunks many of the myths surrounding evolutionary psychology. As a discipline, it has fallen victim to many mis-respresentations. It's a shame that so much of the discussion around it in the media is so off-base and mis-informed. This book is an excellent way to sort the reality from the propaganda.
Very highly recommended.