I am 21 and grew up in a solid Christian home. I was sheltered and protected from sexual situations growing up, so much so that I didn't really see myself as a sexual being. I had been taught about purity and was dedicated to waiting. Imagine my surprise when I found myself quick to compromise in a friendship with a guy. So I bought this book.
This book is not perfect, and I wouldn't recommend it as the sole resource for a young woman seeking to understand her sexuality as a Christian. Even so, it's helpful. I was encouraged by it, even though it is geared for someone younger than me. For most girls my age who have dated before or dealt with this longer, this book will be too young.
Mothers, I would encourage you not to be squeamish about the fact that this book is frank. You don't need to have "the talk" with your daughters... you need to have an ongoing discussion. It was very easy for me to make promises when I was 12 and sex sounded gross anyways, but now I need solid, honest advice and accountability. As hard as you try, your girls will be exposed to all of this (by "this" I mean masturbation, oral sex, etc) and they will only respect you for being willing to talk honestly about it. Being scared of sex is NOT a good long-term plan for purity...believe me. Because my sexuality was not integrated into who I was and what I was willing to talk to God and others about, I was very vulnerable.
Pros
Jesus is at the center, as He should be. This book is chock full of scripture.
This book is honest, practical, and specific. As someone else mentioned, they did fail to address pornography, though the section on masturbation was helpful for me because I was never sure whether it was a bad idea or not (the church does not talk about these things nearly enough!)
The testimonies from girls in their teens or early 20's helps girls remember that they're nowhere near alone in this and that it's NOT WRONG to deal with sexual temptation.
They deal with the emotional, mental, physical, and spiritual aspects of purity.
Cons
It came across as a little cheesy at times, especially in the "Christianese" paragraphs they added at the end of each chapter. I love Jesus but I had to chuckle at times. Changing the verses (ex: no temptation has seized you except what is common to [woman]) makes them awkward, though I understand that they're trying to make them relevant.
It is geared for high school age girls, making it a little young for single adults like me.
Some may find it too "old-fashioned," but I think aiming for a high standard is a good idea. It's at least worth thinking about (and praying about).
The introduction and other sections of the book tend to paint guys as somewhat dangerous, manipulative, etc. Not all guys are out to use girls, and I believe that the idea that guys can compartmentalize and not get as emotionally hurt by casual sex is not really true.