Sex education in schools

What does everyone think sex ed should be like in schools? Personally I think it should actually educate, rather than aim to prevent sex from happening. Let's have people come out of sex ed with a good knowledge of sexual etiquette and the knowledge to please their partners. (Oh, this comes from someone whose school had abstinence only sex education in which it was taught that condoms with neither prevent disease nor pregnancy. I'm not making that up.)

Sex ed. should be taught the same way we teach math: absolutely no exposure to it until the information is needed in real life. That way, our kids can grow up to be taken advantage of and robbed by the grocery store teller who knows more about math than they do.