this debate has gone on a long time. But I think the problem for me is how you define "black" or "white". DNA-wise you would not be looking at the color of anyone's skin. because there is little or no difference between Latinos and Europeans or Africans and Middle Easterners. On a cellular level we are even more the same then we are different on the surface of our skin.
I think the real question comes down to are Europeans or Africans bigger. A long standing pissing contest that obviously carries huge racial baggage. Nevertheless, while some real studies show small differences most contend that there is no real difference in the two. And when you factor in the height and weight ratios for asians, I doubt there would be any big difference there either.
Maybe this will go over most peoples heads, but wouldn't it make more sense to ask the question by class comparison than by race? I have spied ALOT of cock in my day--flaccid and hard, and I have found that it is more likely a class thing than a race thing. Hard working and poorer class people have less to value in life, therefore a big warm cock in bed next to you at night is a likely way to find more satisfaction with the world. While wealthier class people place greater values on wealth and stability and would likely judge a man less on what he has between his legs and more on what he has gathered and maintained in life.
I know this all seems far out there but hey, it kinda makes sense to me.
Just my two cents