Forbidding children to go on dates is asking for trouble, because if you tell them ''no you CANNOT go on a date you are young and irresponsible still'' kids will go on a date to spite you and prove to you that they are all grown up and responsible.
And what better way to feel grown up than have sex.
Parents need to educate and tell children about boys and sex and talk to them about it, not cut them off complitely till they are certain age.