El Fleming, Sykes "Adam's Curse" Comparison

Sykes, author of the book "Adam's Curse," describes the evolution of gender in humans. As is described in every religious book in existence, men and women are different. There are fundamental differences in how we act and look, what we are capable of. Sykes creates a compelling argument for the same thing, although he does admit that this is not proven, and is simply a theory that is by all means possible. He describes how we could have simply evolved to carry out two different roles. I do not agree, but I admire his research and his luck.