Your statement is BS.
I don't know when you grew up but the Government stayed out of families when I grew up in the 50s. Morality was in, that is true, but it was "in" because the people wanted it such and carried it out at home. It was socially unacceptable for a girl to get pregnant when not married and this was the deciding factor when girls were making out in the cars with boys. Yes, fear of God may have played a part, fear of mom and dad was the biggest deterrent, for the boys too. If you were a boy did manage to have sex, you tried your hardest(no pun intended) to NOT get the girl pregnant! The consequences were just too great! The Government played no part in this, it was a societal thing and needs to be again.
The governement has no business teaching our children about sex, hetero or homo, period. Morality isn't something you can legislate and until our citizens make having sex by unmarried teens morally unacceptable in society our teens will have sex and STDs will continue to be a problem.
It should be obvious by now that teaching sex in school has done nothing to reduce teen sex nor has it reduced the incidents of STDs. Most teens don't think safe sex is cool, if they use that expression any more, and do it without condoms. Teaching at home and leaving the government out of the sex training business will work better than the system today.