I use an average. I'm 6.25 towards the top and a little over 6.75 at the base. so re: cock size I say I'm 7.5 x 6.5. my wife told me once that the last bit of my cock going in good be pleasantly painful, and I said, "a bit too long?" "No, a bit too thick", she said. "it goes from tight to tighter."
re: statistics...not sure how accurate the stats are but out of 100 men, only 4 will have a cock as big or bigger than mine. before I was married, I got around pretty good with the ladies, none ever commented on my length, just my girth. I heard "Oh My God," a few times.