The only beef I have with this book is that the authors used wildly outdated research on homosexual promiscuity at the very end of Chapter 27, which was obtained from a 1995 book that debates homosexuality. It was written by a Christian man and published by a religious publisher. Why the authors chose a 1995 "study" from a book debating gay people in their work published in 2016 is beyond me. Surely there was a more recent and less biased study to use?