I found a survey online that's supposed to be able to predict penis size. It was accurate for me (it said I was between 6 and 6.5 inches), but because it seems to have an upper limit of 7.5" I don't think it will be accurate for some of the guys here.
Here's the link: http://www.okcupid.com/tests/take?testid=1...656394801552158.
Here's the link: http://www.okcupid.com/tests/take?testid=1...656394801552158.