Someone is going to say "the girl is very petite and the camera angle makes it look bigger and her elbow isn't at the base of his penis when she's comparing the two, and the video ratio is stretched, so I'd say he's 8 inches... perhaps 7,5 tops, judging that he's probably 4 ft tall. And the camera adds 2 inches, so his penis is no more than 5,5 inches. And it's obvious that I am jealous of his tool, which makes my estimated measurement decrease at least another 6 inches. So a realistic measurement would be minus 0,5 inches. Stop living in your fantasy world. All penises are the same size as mine, or smaller. Even the ones that are quite clearly bigger. So there."
... but I would argue that he's giving Mandingo good competition lenght-wise. And I've seen a real proven 10-incher. And this, my friends, is longer than 10".