If this squicks you, you might want to read some Sarah Dessen (there condoms break on first ever sex, the boy gets killed the next day and the girl gets pregnant, or the thought of having sex alone causes car crashes), Judy Blume, Daria Snadowsky (HS love never lasts, keep your virginity for when you marry), David Belbin (all men are pigs, all teachers are potential child groomers, older men want sex only, if you are a week due you don't test, you assume you are pregnant even if intelligent) or Kody Keplinger (sex is not exactly a good idea, or a weapon against men, 15 year-olds all talk and think like sarcastic centenarians).

I have yet to read any halfway recent YA novel which is even close to positive about youths and sex. The tables have irretrievably turned, we are already quite deep into a new age of puritanism and sexual repression and it won't leave us any time soon. It goes to tell that one of the best ever visually driven books on sex education for children and youths these days is considered being childporn. (http://en.wikipedia.org/wiki/Show_Me!)

BTW, #5 is not out of the world at all. There are girls who still believe that they can't get pregnant when they do it standing up, loads of girls who enter (and leave) college still virginal, and not exactly few who know so little about their own anatomy, that they try (and do!) insert tampons anally or into their urethra. Talk to any British A & E surgeon, or a few of the nurses of sex education centres, or read up on scarleteen.com.