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I think the implication here is that horny teenagers are going to do horny teenager things. So it's not fair to compare porn to just any activity, we have to compare it to things like teen pregnancy. Which is WAY down, by the way.

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That's complete nonsense. Exposure to pornography during adolescence correlates with increased risk of teen pregnancy, risky sexual behaviours, and sexual assault.

[const_cast]

Based on what? Just intuitively, there's significantly less teen pregnancy today than ten years ago and it's been trending down for decades.