Flashback Friday: On the purpose of kissing.

Have you ever really thought about how weird kissing is? Why do humans choose to mash their lips together as a display of affection? (The only other animals that we know do this are Chimpanzees and bonobos.) The two scientific studies below set out to determine the function of kissing in humans. The first used a survey to find out why people kiss. Interestingly, the researchers found little evidence to suggest that the primary function of kissing is to promote sexual arousal. Instead, they t

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