You know this one comes up alot on this site. For me I think the true indication that you are larger than normal comes from your sexual partners. Now measurements aside if the girl/guy that is recieving what your giving finds you big/huge/massive whatever, then you have little to worry about. What is big to one, is not big to the others, but is massive to the next, it is all relative. So relax, enjoy, forget the statistics and the measuring tape, and have fun.