Let me start out by saying that this book is definetly my favorite that i've read all school year(maybe even ever). The content isn't really that bad. But there is some mention of sex, as in talking a little about STDs and virginity. But the only part that was that bad was the mention of oral sex, it wasn't in there directly, but you'd after to be a pretty dumb person not to get what their doing. Wasn't in any detail though, and it was only mention in a few tiny paragraphs. Violence is there too, which isn't suprising in these modern faerie tales, considering most faeries are evil, it's not too gruesome but is definetly pretty bed. Language is not such a big deal, couple curse words here in there, but it's not like the book is filled with it. There's some drinking, but it's only a little, except for when the main character gets drunk on faery wine, but other than that it's really not too bad. I think it's definetly a good book for a mature reader, but 13+ seems reasonable.