When I was a kid, sex education was about the biology of reproduction, development of the unborn child, and some info on sexually transmitted diseases. There was no 'instruction' on how to have sex (other than the basics around the biology of it all), no discussion of deviant sexuality. Sounds to me like that's the kind of stuff schools should get back to - leave the other stuff to the parents.
So parents should teach their kids how to do the deviant stuff? ;^)