I guess there is two ways to measure. Either from the front side (Pubic bone area, to the tip) or from the back side. (Tip to balls) and I also imagine both measurements would be quite different! I imagine the back measurement would be a few inches more than the front measurement.
Who knows though. I don't actually care really...my post was just in jest because of the exceptionally large amount of extra extra large penis measurements! I was just ribbing the guys lol.
Like MrsMc said, there are so many penis size posts that you start to lose the will to read them. Also lose the will to type out "Size doesn't matter" 3000 times so I thought I would try ribbing instead. Hehe