This attitude is about 40 years old and started with the hippie crowd in the 1960s. Prior to that in this country, morality was considered very much in the interest of the state for the commonly understood fact that an immoral people cannot remain a free people. Morality and freedom are as inextricably linked as mass and gravity.
The words to America the Beautiful understood this: "Confirm thy soul in self control, thy liberty in law."
You cannot expect state imposed lessons on abstinence, often taught by teachers who are openly fornicating, to carry the same weight as that from parents or clergy. Government's role is not to subsidize immorality, but it cannot make people sexually moral or turn back the clock.
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.