So far the most rigorous survey of penis size was that Lifestyles survey that pegged the average length at about 5 7/8 inches, though it probably is lower, since the participation was voluntary and likely that a lot of average and below average guys or guys who consider themselves such wouldn't volunteer to be measured. Alright, so let's say 5.5" is about the average, and that the standard deviation of about 0.75" that Lifestyles came up with is right.
The breakdown:
Going up from the average by 0.75" for each standard deviation
5.50" 6.25" 7.00" 7.75" 8.50" 9.25" 10.00"
So you get to 10" a full 6 standard deviations above the average. To put this in perspective, the average height in this country (U.S.) is about 5'10", and a standard deviation in height is about 3". Ok, so going up by 6 standard deviations from 5"10" is:
5'10" 6'1" 6'4" 6'7" 6'10" 7'1" 7'4"
So basically, finding a 10" penis would be something similar to finding a 7'4" man. Good luck with that one.
Given that over 99% of results (about 99.7%) will fall within 3 standard deviations of the average (for penis length that would be between 3.25"-7.75"), and 99.994% will be within 4, 99.99994% within 5, and 99.9999998% within 6...again, good luck with that. :tongue:
I don't think I've ever seen a real one in porn or anywhere quite that long. A few close to it maybe, but nothing beyond it.