Chimpanzees have gigantic testicles because ovulating females mate with the every male in the group: https://www.nytimes.com/2000/02/22/science/battle-of-the-sexes-is-discerned-in-sperm.html …pic.twitter.com/NdFE8P21yc
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This paper is actually more embarrassing for Diamond than it looks, because it raises the obvious possibility (which he rejects) that large African genitalia evolved because of sperm competition i.e. they evolved large balls to outcompete the other dudes running the train.https://twitter.com/crimkadid/status/1349833082325639170 …
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Yes, it is me, Ryan Poppadoupoulos of Palm Springs.
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