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Decoder Ring: A Brief History of Making Out

Slow Burn

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The Evolution of Sexy Kissing

Dr. Duvall: The variation in the Great Apes supports the idea not that sexy kissing is programmed into humans, but that you'd expect to see some variation in humans too. Some of us sexy kiss and some of us only affiliative kiss. But either way, Dr.Duvall thinks both behaviors are really old. It's probably a couple of million years old. We're going to turn to another species that might be able to give us our oldest clue about kissing yet.

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