"Pornography, in which male performers are often selected for their extremely large genitalia, may be partly to blame. Similarly, Herbenick points to the myriad spam e-mails that assert that 17.78 cm (7 inches) is average for an erection, when in reality such a member would place its owner in about the 98th percentile. It’s best to just ignore those ads in any case, Veale says. “There are no effective lotions or potions or pills.”
I find this very hard to believe. I guess if you count ALL men--ethniks, the impotent, old guys, fat guys, virgins of various stripes--it might be true. But I doubt 7 inches seems like 98th percentile to your average bed-hopping 21st century thot. Above average? Sure. But not 98th percentile.