I don't normally count textbooks, but I think I would have tried reading this even if I hadn't HAD to. Unfortunately, it's not a well-written book. Much of the coverage is surface level - there's a difference between a survey of literature and a pass-through of knowledge. This book is the latter. Additionally, the authors make some statements about sex, gender, and sexual orientation that are actively offensive, dismissing a lot of respected academic literature to forward some pretty archaic ideas about all three.