Which end of your spinal cord would you rather have "well endowed"? Ok, guys. Here's the scoop on why you are so tiny down there if you are East Asian or White!
"It has been proposed that the farther north the populations migrated out of Africa, the more they encountered the cognitively demanding problems of gathering and storing food, gaining shelter, making clothes, and raising children successfully during prolonged winters [ref]. As these populations evolved into present-day Europeans and East Asians, the ecological pressures selected for larger brains, slower rates of maturation, and lower levels of testosterone—with concomitant reductions in sexual potency, aggressiveness, and impulsivity; increases in family stability, advanced planning, self-control, rule following, and longevity; and the other characteristics listed in Table 3. [below] The fact that the three-way pattern in IQ, brain size, and other traits is not unique to the United States but occurs internationally is consistent with a single, general (genetic-evolutionary) theory, whereas culture-only theory must invoke a number of highly localized, specific explanations."
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