There's a fundamental misunderstanding about sex in this country, and I want to talk about it.
We here in the US are VERY DETERMINED that our teen kids not have sex, and that people don't have sex before marriage. However, no one knows WHY. No one understands what the actual reasons are for "not having sex." It's based on the judeo-christian perspective that "sex before marriage is wrong," but... the logic of such convictions is lost on the general public. So I want to get into "the why."
THE WHY is that Biblical Christianity teaches that when you have sex, the two become "one flesh." It doesn't matter whether they are two married people, or two single people... no matter what, when two people have consensual intercourse, they become one flesh. This relationship must be eternally enjoyed, or eternally endured. That means sex before marriage leads to eternal consequences. What those are, are anyone's guess? But they exist. That's why, from a Christian perspective, we try to discourage immoral sexual behavior - because it creates a permanent relationship between the two people having sex.
This thinking has been lost in the details. Our culture doesn't understand our obsession with abstinence, and THE REAL PROBLEM is that "neither do we." NO ONE understands. So they think it's stupid. It's not stupid? But without an agreement that having sex creates an eternal relationship, we can't expect unbelievers to go along with our preoccupation with abstinence. It's unrealistic. I think it might be best for our culture to not assume that teens are going to follow our advice (at least in schools) and teach them how to have safe sex. And in our homes... the homes of Christian teens... teach them that sex creates an eternal relationship that is unpleasant outside of marriage, and is no good for you.
Bottom line - it's not our schools' jobs to teach this. It's up to Christians teaching this in homes. And we need to stop hamstringing our schools... nonchristian teens will not be able to get their minds around our reasons, because they don't believe that they are true. And we need to accept that reality.

