It's been proven... sex sells. As long as it can add to their final gross they'll add as much as they can. Some of it could also be writers misrepresenting the generation they're writing about because they’re ignorant. Other times it could just be Eli… errrr… the director, wishing he was making porn instead. I don’t think there’s one “right” answer, Nova’s point was valid as well. It all depends on the movie I think.
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