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#520 - Robin Dunbar - The Evolutionary Psychology Of Love
Modern Wisdom
Is Cuddling the Same?
The speed that you rub somebody with needs to be slower than one and a half inches per second in order to get the optimal endorphin response. If you go substantially faster than that, it doesn't trigger the receptors in the skin. That's about the speed with which the hands move across the fur, parting the fur during grooming in monkeys. So they're looking for bits of rubbish and stuff in the fur. And so they're constantly parting the fur with both hands. It's that movement deforms the skin and triggers these receptors. But if you do it at 30 centimeters a second, it has absolutely no effect.
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