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#520 - Robin Dunbar - The Evolutionary Psychology Of Love
Modern Wisdom
Polygamy
All our ancestral species going back to the astrolopithecines seem to have been polygamous. They show a strong anatomical signature of polygamy. It's only modern humans. That's what's known as the 2D-4D ratio, the ratio of the index finger to the ring finger. More testosterone is shorter index finger. Short index finger means that you are on the home more likely to be promiscuous. And it's kind of indicative of high testosterone levels,. So male babies, because they're obviously switching over from being a kind of generic non-sex.
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