I just realize, probably there's a misunderstanding between us. It's because I live in the East, and you are in the West. I don't know much about sexual education in the West. But in the East, one purpose of sexual education is to avoid free sex.
What are the teachers in the East teach?. For kids is introduction to puberty, like menstruation for female, and sign of puberty for male. After reach puberty age, the lesson are: why male attracted to female -vice versa, what the risk of free sex, how to avoid free sex, etc. also, what is homosexual and lesbianism. There's no lesson about how to get sex.
But actually, there's no special subject about sex. But sexual education is given in several subject like in biology, or religion. Or, in special time/special occasion.