The statistical evidence seems to suggest that the AFrican American men have slightly larger penises. My unscientific observation in locker rooms is that on average black guys tend to have larger flaccid penises. I haven't seen any (just one) erect so I don't know about that. The large black penis has been used to create stories about black men as sexual monsters and predators, which, of course, is very destructive. But some stereotypes have their basis in fact. I suspect that there may be some truth to this. But why does it matter? Some folks are just more gifted than others.