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Notes -
IIRC there’s a bunch of nerve endings down there. That kicks the can down the road, but my (uninformed) guess is that evolutionary biology has a lot to do with weird compromises from millions of years ago. Did our synapsid ancestors still have a cloaca?
Do other female mammals find the act of penetration itself during estrus pleasurable? Or is it more about getting rid of the distressing psychological urge to copulate?
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Some primitive mammals have a cloaca, so I would assume so.
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