This is an excellent book that Christian parents, church leaders, and all others responsible for shepherding young adults must read. The book was both very interesting and highly readable for non-expert audiences.A note: If you're sheltered and can't handle honest facts about sexual behavior (including deviant sexual behavior), this book isn't for you. That being said, if the world, the flesh, and the Devil are going to talk about sexuality constantly, we Christians need to talk about it, too. In fact, this is one of the main takeaways of the entire book: Christian leaders need to do a much better job training young people about biblical sexual ethics than we have been doing over past decades.Here are my favorite things about the book.1. I was impressed by how focused the entire book was on the gospel, embedded within robust and balanced Reformed theology. Ayers emphasized that worldview teaching about sexuality must be presented this way, and he modeled this throughout the book.2. Accordingly, the entire book was pastorally focused and realistic in how to apply these concepts to sinners such as we are. The presentation added no unnecessary offense to the content; the content by itself is offensive enough (in the proper biblical sense of the truth being a stumbling block). And leaders can take away plenty of practical suggestions for how to improve their shepherding in the area of chastity.3. Of course, the entire book was painstakingly researched, supported, and documented. Sometimes I felt that every paragraph must have reflected 10-20 hours of careful research. Sometimes every sentence, 10-20 hours of careful research. It is most reassuring to know that Ayers is not just making stuff up. I only wish that the graphs and charts could have been larger, and in full color, but I completely understand why not (budgetary constraints of this project).Thank you, Dr. Ayers, for laboring so diligently and faithfully to bless the church with this book!