Largest penis by race
In the Dr. Jacobus survey definite penis size differences on a basis of race were detected. The largest Arab penises were found to be between eight and ten inches; but it was among the Muslim Sudanese that Jacobus found "the most developed phallus" - notably "one of the maximum dimensions, being nearly 12 in. in length, by a diameter of 2- in." The hardy researcher remarked that this was "a terrific machine" - "more likely the penis of a donkey than of a man." He concluded that the "Sudanese Negro possesses the largest genital organ of all the races of mankind". In a less extensive survey, but equally interesting, Dr. Robert Chartham measured erect penises for groups of men of various nationalities. The largest organs for each nationality were as follows: English - 10½ in.; West German - 8½ in.; Negro - 7½ in.; French - 7¾ in.; Danish 8 in.; American - 7¾ in.; and Swedish 7¾ in. The groups were small, ranging from only 9 to 121 individuals; nevertheless the data acquired are not without significance.

I can not find it right now but there is a measured survey that stated men of african descent were larger when soft than caucasian men when generally their erections are about the same.

So far this seems rather true. Whether black or white the average size seems to be about 6 inches.

Oh and I agree with Madame the average seems to keep getting smaller. I personally thik they keep changing the statistics to make men feel better about themselves.