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If you've spent any time in the presence of parents (or worse, grandparents), you probably assume that previous generations were prim and proper and kept their hands in their laps and their ankles modestly crossed at all times. And sex was 100 percent squeaky-clean and discreet.

As it turns out, people in the past were as freaky as (and in some cases even more freaky than) we are now. Just consider these images, while trying to banish those aforementioned grandparents from your mind:

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