Between XX and XY: Intersexuality and the Myth of Two Sexes

I suggest you have read some evo-devo before delving into this book. The premise is that gender is at least as malleable as eye color, body height and weight, and many other characteristics. Beyond that, there are many variations past XX and XY, and the current thinking is to place every child squarely into the XX/XY dichotomy. Additionally, recent medical practice has been to do so with or without consent of parents??? (no verification or sources of this) - a plea for acceptance of those that fall somewhere between these two endpoints - and an attempt at scientific explanation of how much diversity there is in between. I recommend this book, even though I thought it could have been better written. The information is substantial and crucial to our understanding of gender.