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#520 - Robin Dunbar - The Evolutionary Psychology Of Love
Modern Wisdom
Kissing
The key to it is your exchanging information on your... essentially your immune system. A five-minute kiss results in the transmission from one person to the other of tens of billions of chemicals and bacteria. The same genes that determine your smell are the ones that determineyour immune system. What you're looking for is somebody who kind of looks like you in all sorts of ways, so it's keeping a good bunch of genes together from your extended family. This is what's known as optimal inbreeding or optimal outbreeding.
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