I have to say I'm finding some aspects of this thread quite interesting. I geuss I look at this issue from a very differant perspective in that I know alot of women and men who chose to remain celibate until after marriage (or are unmarried and celibate) so I don't see it as a given that woman (or man) will lose her virginity as a teenager or that she will have multiple parners before she settles down with a life-partner. I'm aware that in the current climate that this attitude is unusual and to a certain extent subversive in that rejects the sexualisation that underpins alot of our cultural discourse.
Personally I think that most young women are wise enough to understand a 2 dimensional approach. That these steps are nessescary to protect from preganacy and STDs but that a better protection is abstinence and a partner who respects them enough to not to pressure them into sex before they're ready.
I don't really agree with the stereotyping of all teenagers as moody and belligerant either. Some of the most intelligent and coherant women I know are teenagers. TBH some of them are more mature than many of the supposedly adult women I know.