Studies, globaly, have long determined that the average dick is 6 inches long. It has been well documented and it is easy to look up if you really want to know. The adage that everybody lies about sex generally applies to men - and the size of the equipment. One problem is that porno stars and men who like having their picture taken tend to be well above the average - which is why they get their picture taken!
(Six and a half by the way).
Starlight