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Video: The science of kissing

Why do we kiss? Well, duh, because it feels good. But why does it feel good?

When you really think about it, kissing is an odd human behavior. You know, all the rubbing of our faces all over each other. So there must be a good reason why we do it, right? From motherly comforts to testing the genetic compatibility of your mate . . . the science of kissing is pretty awesome.

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