And that's the real problem. How can you teach kids that oral or anal sex IS sex without informing them that oral and anal sex exist? How can you teach kids to protect themselves without telling them (or showing them) what to protect themselves against? Yet too many parents are terrified of letting their kids know that there IS such a thing as sex. Far better, they seem to think, that the kids shouldn't even know about it until after they're married. Until then, just pretend it doesn't exist.
That tactic doesn't seem to be working, does it?