Well, I didn't want to rant on the whole "15 years old is too fucking young and stupid to be having sex in the first place."
But now I've said it, and it is, so there.
BTW, that applies equally to males and females. Try to be a kid and have a life before you run any risk of making babies you don't want, can't afford, and will always resent in some dark recess of your soul.