I agree with you, gulliver!
There are lots of things children can't be exposed to until they're at least 18. The age probably needs to be adjusted, even still. Brains do not stop developing until sometime in the mid 20's. And I have to wonder if, as far behind as development in normal situations is for boys, if maybe things should be denied until they're at least 30.
Problem with it, is no matter what medium it is, boys will still gain access to it by hook or by crook. Look how many got started with they're father's Penthouse stash! What we need are better parents to these kids. The kids will do whatever they think they can get away with, and if there's no adult around to squash it, then they just go on testing boundaries that seem to have no stopping point. If their own parents won't punish them, the school teacher, guidance counselor, principle, or safety officer won't help they have no one to deter them from their actions.
That leads to thoughts of separate schools. But those end up a disaster because the girls' are always underfunded, taught differentially from the boys, and yet girls are more developed and more intelligent that boys at the high school age. But the boys school gets all the money, the best teachers, and the best curriculum. Why? Because it's "just girls" over in the other school.
There is just so much prejudice and no way to seemingly get a handle on changing that with white men/boys.... and this one, I can't even declare just white men/boys. It seems to be a part of the male species, itself... regardless of color or culture.