You're sitting in your living room with the grandparents, settling in to watch the evening news, when suddenly, up there on the TV, hardcore porn! Wow! Embarrassing! Where did that come from? You rush to turn the set off.

This is the phenomenon of accidental porn. Try as we might as a species to maintain a veneer of decorous behavior in public settings, sex finds a way in. By accident, of course. Porno pictures suddenly appear in powerpoint presentations. Late night TV movies get mysteriously replaced by x-rated skin flicks. Topless shots flash onto the screen during high school assemblies.

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