the way people see cocks is, for every inch over six, add 3 inches
so to a woman or stupid men, 7 inches = 9, so if they say 11 it means just over 7.5, close to eight, and anything near eight is a legit huge penis.
there is not an 11 inch penis anywhere in porn btw, men with dicks that big can't really use their dicks, they're somewhat impotent