Comment 8 by aquilacane :

Abstinence is the best preventative method of birth control. For the girl in the photo to say "screw abstinence" I find a bit dumb and against the goal of sex education. I know she's trying to be sound bite-ishly cool, but it sucks as a message. "Screw abstinence only education" I can get behind but that's too long for a t-shirt, I guess. Abstinence should be the fist line education message followed by a close condom/pill if you have to message.

'Most effective' doesn't necessarily mean 'best', though. The most effective way to not be in a car crash is to not travel by car but that's not really the best method.

I don't see why abstinence should be the main message but they should try to teach kids that there's nothing wrong or uncool about waiting if they want to.