Comment Re:More importantly (Score 1) 1293
Because the sperm needs a temperature a bit lower than body temp in order to be generated.
And isn't that a really dumbass design? Surely an intelligent designer would have made sperm nice and happy at body temperature. And here's the silly thing: there's a fair bit of body temperature variation in mammals, yet none seem to manage to have the testes inside.
Why don't male birds with even higher body temperatures fly around with a pair of danglies hanging below their feathers? Perhaps the designer decided that birds were to get better features like body temperature sperm and uniflow lungs.
You seem to underestimate the irresistible attractiveness of danglies, moreover, if you are unable to prevent a male competitor to bite yours off, you don't deserve reproduction.
Maybe the designer isn't that intelligent, but she's got a sense of humor.