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Anonymous
>>735376
All enzymes have an ideal temperature to function at. For Boroeutheria (rodents, rabbits, primates, bats, cetaceans (whales, dolphins, porpoises), ungulates, and carnivoes) that temperature is slightly lower than body temperature.
This could be because it is just better, and there is no evolutionarily available better solution that works inside the body. It could also be that sperm competition made some males put them out there just to have more space for bigger testes, and now the enzymes are accustomed to lower temperatures. Birds have internal testes kept at body temperature, and they have don't have any problems. Whales and dolphins have internal testes, but have complicated vascular systems that keep them cool.
So there'd just be reduced (male) fertility, not sterility.
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