AMAZING book. I'm 15 (read this book when I was 14) and I couldn't put it down. These are my favorite books of all time and I have read them many times. My only concern as a teenager was that the characters made stupid mistakes (hence the negative role models) but in the end they realized that what they did was wrong, whatever it was that they did. I wouldn't say there's "sexual" behavior but there is definitely some material about inappropriate acts, although they are not in great detail. Overall, a book that your kids will enjoy -- take it from me, I am one!