Why are male testicles on the outside when they hurt so much if hit?
You have asked the question backwards. As you now know, to make sperm properly, the mammalian testes need to be slightly cooler than the rest of the body and are, therefore, positioned on the outside. So, your question should be: “Given that the testes need to be outside the body, why are they so much more pain sensitive than the other appendages, like the fingers?” The answer is that evolution has made them highly pain sensitive in order to make sure they are carefully protected by their owner. Think about it: it hurts to bang your finger, but apparently not as much as getting hit in the groin. And so, a male bangs his fingers over and over again, cutting them, smashing them, crushing them in doors, and so on. But guys couldn’t do that with their testes because you can still reproduce if you lose some or all of your fingers, but men cannot reproduce if they lose their ability to produce sperm. Consequently, any male who is born who does not feel lots of pain when he gets hit down ther
