As mindboggling as the above video is(and I can't stop facepalming right now the decision making processes running through the adults brains) I would have to challenge you to post the era/place in history where people were so moral.
In ancient greece having young boys as sexual partners was an accepted practice.
How old do you think Mary was when god knocked her up ? If you believe in such things.
Middle-easterners are hardly the first people to train/use children as soldiers.
Today we are educated enough to actually teach young people not "why you should never, ever ever have sex", but "why they should be more safe and more selective when choosing partners", ie disease, early pregnancy, and the consequences of said actions.
Naw, fuck that shit, lets just tell em jesus don't like it, so don't do it. Forget what I did when I was your age, just don't.