I really don’t know why. It’s one of the myths. i think men of any race if they were told they had the biggest penis size they would be quite happy. I can’t imagine any man who is assumed to have a big penis to get up and say nope, it’s pretty tiny.It’s all part of the mystique of black men and they themselves don’t feel like denying it. It really isn’t true. i can tell you this from my experience.