Study says men with beard & long hair have smallest testicles
Posted on April 10, 2019 by Dr. EowynA study of over 100 primate species, including humans, by three evolutionary biologists from the University of Western Australia and the University of Zurich, found that the more “showy†and “ornamental†the males were, the smaller their testicles were likely to be.
The study by Stefan Lüpold, Leigh W. Simmons and Cyril C. Grueter was supported by the Swiss National Science Foundation and published as “Sexual ornaments but not weapons trade off against testes size in primates†in the journal, Proceedings of the Royal Society B, on April 10, 2019.
“Sexual ornaments†of male primates refer to secondary sexual characteristics used by males to attract females and to signal social dominance within the group. Those sexual ornaments include red chest patches of geladas, cheek flanges of orangutans, hair capes of hamadryas baboons, enlarged noses of proboscis monkeys, and the beards of men.
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