What I liked about Chaste was that it dealt with chastity. (Duh! It's right there in the title!) Like I said, it deals with chastity. As an issue. In a YA book. In many YA books to-have or not-to-have sex is kind of glossed over. It seems that this question-- to have or not to have-- is either THE MAIN ISSUE or is mostly avoided. There are stories about YAs who are having sex, some heart-wrenching stories about those unwillingly having sex, or stories where sex is never part of the landscape, so to speak.
I think that makes perfect sense, because it probably reflects reality to a degree. But if people are NOT having sex in YA books, there is not often a reason given. I don't think that accurately reflects reality. Because in high school (at least in the deep South 20 years ago when I was in HS... which, granted, may not reflect reality then or now), there are people who are not having sex, and when that's the case it's often because of their faith.
So I loved that the author created this character, Quinn, who is so sincere, so likable, who is trying so blessedly hard to do what he believes is the right thing. And that he's challenged. And that it's not easy. And that he's able to be a true friend to the very, very broken Katarina who has used her sexuality in the past in a way that doesn't end up making her feel that great about herself. The author doesn't hesitate to deal with this issue head-on, and I'm so glad she didn't.