I think if kids have been raised right and told to avoid sex and they decide to have butt sex instead, there isn't much more a parent could have said to prevent it.
Have fun.... I just think there is a certain thrill people get in talking about this stuff... it's as if it's OK to throw out all rules of decency because it's news.... Pornography of the mind without the guilt of actually doing it.
Actually, this is example of how screwed up sex education is in general. When the message kids get is "don't have sex because a) you'll get pregnant b) you'll get a disease," they logically look for alternatives that will eliminate the risk of one or both. Morality isn't involved at all.
It's like telling your kid, "Don't deal drugs on the street corner because you might get caught. Keep it in doors."