And how, pray tell do they get that experience if they are forbidden by the law, and parents don't want to talk to them about it, are afraid to talk to them about it (in the case of a single male parent, talking to his preteen/teen daughter about sex, taken the wrong way to a jury of his "peers", could be jailed.) or don't care to talk about it? Our solution? Force them to wait til their parents are no longer "legally" responsible for them, and them abandon them to the world.
Admittedly, not every parent abandons their child at 18, but how may of your friends tell their children "at 18 you are out?" This is the main reason for our unstable relationships, as when the brain has been designed to learn about dealing with the opposite sex, at puberty to full brain maturity, we try to force our children to not have sex, and then we wonder why they end up pregnant before they ever leave home.
Since the law says we don't need to deal with it til 18, we let it go.
Now, I am not agreeing with non-consensual sex, with rape, with child abuse, or any such thing. I am advocating EDUCATION!