Several studies have been done by prominent universities in America such as Johns Hopkins and their findings were this> Men like Mandingo, Jack Napier etc are nowhere near the "norm" for black men. The biggest of the big penises are usually found on black men, BUT there are actually more white guys with above average to large penises than black guys. Basically with black men, they found that their penises many times appear larger because they don't shrink very much when limp. The reason for that is evolutionary. Penises, like your head and feet, are one of, if not THE biggest heat releaser. Soo basically, since blacks ancestry is in hotter climates in Africa etc, the penis would stay long even limp soo that it could have more surface area to release body heat. When it got hard, it didn't grow a whole lot bigger. Whites come from colder climates where the penis would shrink when limp to make for less surface area so the body could retain heat. Therefore, the white penis grows significantly when erect because they usually stay smaller limp. Don't you ever notice that during the summer, if it's real hot outside your penis is larger limp?? Same principle. Also, it's the reason your penis shrinks in a cold pool. One other factor is natural selection. As horrible as it was, when slavery was going on, they would treat the blacks like animals and only select or breed the bigger stronger blacks which is why there are more big strong, atheletic black guys than white guys. You naturally would get an average of larger penises if you were only breeding the biggest black men at that time. So, overall the study found that blacks and whites are almost exactly the same when it comes to penis size. There are a few black guys with abnormally huge ones, but there are also some huge white guys. It found that there are actually more whites with 7-9" cocks than there are blacks, but the big blacks are REALLY big. Everyone else falls into that 5 - 6.5 inch range which is considered the average.