No, condoms can't protect you from every single thing out there, and abstinence is the only 100% foolproof method of preventing STDs and pregnancy. However, that's why sex ed should become a broader, not narrower, field of study. This sort of thing, with statistics that are basically pulled out of people's arses (50% of gay teens are HIV positive? Where? South Africa?) and a sense of deep abiding shame regarding one's own sexuality. It's treating sex like something dirty that makes people ashamed to openly discuss their sexual history with their prospective partners. If people talked about the whole thing more, with less stigma, there'd be more treatment, less transmission and, as a result, fewer instances of STDs as a whole. Same deal with pregnancy: condoms aren't infallible, the pill's not infallible, and the two together aren't even infallible but your chances are a lot less than if you just say "I'll pull out before I come". I suppose the point is that you can't ban things indiscriminately when it comes to teenagers. It doesn't work that way. You have to explain why, or they're going to feel like you're being condescending, and that just makes it more likely that they'll do whatever they want to prove how 'adult' they are.

Anyway, I'm not talking about addiction, or even drugs. I was pulling an example of other shit teenagers do out at random. I could have picked smoking, drinking or vandalism.