It was the author of the blog who broached this subject, not I. There can be no cite as no proper measurements are done, but the advantage of porn as a guide to reality-land is we can check and see if it is credible. A solid 7'', are you sure you're not stealing an half an inch by pressing the ruler into the pubic bone until it hurts? Where is the ire about that disparity? I really don't see why guys are so worried over it.