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"Male fruit bat of the species Rousettus aegyptiacus have testes that are 2.15 percent of body mass, whereas their brains are only 1.70 percent. The males in some bat species can have testes that are up to 8.5 percent of their body mass."
See article here!
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My brain back, unbleached dammit!
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It'd make a lovely icon picture....
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Like most men then. Small brains, stupid genitals.
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Fair comment though...
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"As we have seen, chimpanzees live in groups where several males may share a female, and therefore there is a premium on the ability to ejaculate often and voluminously [ . . . ] very little is known about the societies of dolphins and whales, but a good deal is known of their anatomy, thanks to whaling. They all have enormous testicles, even allowing for their size. The testicles of a right whale weigh more than a ton and account for 2 percent of its body weight. [ . . . ] For an ape, man's testicles are medium-sized---considerably bigger than a gorilla's. Like a chimpanzee's, human testicles are housed in a scrotum that hangs outside the body where it keeps the sperm that have already been produced cool, therefore increasing their shelf life, as it were. This is all evidence of sperm competition in man. But human testicles are not nearly as large as those of chimps, and there is some tentative evidence that they are not operating on full power (that is, they might once have been bigger in our ancestors): Sperm production per gram of tissue is unusually low in man. All in all, it seems fair to conclude that women are not highly promiscuous"
(Matt Ridley, The Red Queen)
The factors affecting penis size didn't seem as clear. Human males, for some reason, have penes proportionally larger than any other primate. It doesn't clearly seem to be due to the same factors affecting testicle size. It doesn't follow the same pattern.
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Reminds me of your anatomy tutorial story...
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