To any bellybutton fetishist, it's no secret that some races are more likely to have outies than others. It seems that at least 50% of black people with low bodyfat have outie belly buttons whereas indians almost never have outies even if they have very little bodyfat. Whites, Asians, Hispanics seem to be in between the two extremes.
What makes for this difference in outie occurence between the races?