I found this quiz that will guess the size of your cock. It's not just about the size of your hands and feet. For me, it undersized my little guy by about 1 1/2".
http://www.okcupid.com/tests/take?testid=7543575242478348320
B88
http://www.okcupid.com/tests/take?testid=7543575242478348320
B88

