Porn is only one way to put the kids on the wrong path. Another is sex education.
To adults sex education seems plausible enough. But we aren't teaching adults, we're teaching kids. And the results speak for themselves - increase sex education, and you increase sex-related problems amongst kids. I'm too lazy to run around after links this instant, but they're out there.
After all, science is so damned persuasive when it's talking about evolution - why not now?