My boyfriend is exactly 6 inches when completely hard and about average in cicumfrance. His head is a little above average I think. I am just wondering what kind of size it is possible for him to get to? Can he really gain honestly anything? What would you recommend him to do to get gains? I didn't know if like a large one could gain more or less than a normal sized one. I am just kind of in a new place here so. Could he reach 8 inches by like 5.5 or 6 cicumfrance?