A friend forwarded me a couple of interesting articles from the Economist this morning: one about the apparent link between polygyny and shorter lifespans in males; and another about a titillating (had to, sorry) study done recently that showed that female lap dancers apparently earn nearly twice as much when they are ovulating than when they are on the Pill (link to full study here).
These, in turn, reminded me of an earlier study which showed an inverse relationship between brain size and testes size in bats (which has since been seen in primates and other species as well).
All jokes aside, I think it's fascinating to think about how reproductive strategies influence biological development and behavior. We have finite resources to put towards lifespan vs. reproduction, testes vs. brain, and where we wound on that spectrum depended in large part on how much hanky-panky went on between our ancestors.
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