Ragazzaccio: Maybe having huge cocks yourself somehow influences your view at average dick size, so always relating to other "big" men, you may loose the feeling about how normal penises look.
Being gay (I am a 30 year old Scandinavian guy with a pretty normal 18 cm. dick!), I have had sex with a lot of guys. I know many of you may think I am crazy, but I have always written my partners age and dick size down, so I could remember them and compare them. I just calculated that the average dick size of all my partners is indeed about 6-6,5 inches /15-16,5 cm.). There have been large ones and there have been small ones, but most of them were at that range.
The smallest penises I have "played" with were 9-10 cm. long only. One of them belonged to a 24 years old small Asian Guy, and the other one to a fat 19 years old Arab. The smallest one was about 9 cm. (or maybe 8,5) and it belonged to an about 40 years old Scandinavian Man. He told me he had only had sex a very few times in his life, because of being shy about his small dick. I sort of felt sorry for him, and I told him I found it could also be quite exciting to play with such a small one - and I actually meant what I said! I am the guy who likes variation and likes to compare all the time...
I have also had a fem very large cocks. None more than 23 cm. But I have had 5-6 guys with cocks arond 22-23 cm (8,5-9 inches). Interestingly enough, I have noticed that there is absolutely no correlation between body size and cock size, except the fact that fat guys have a smaller visible area of penis. But I had a 21 years old Danish boy, who was only about 1.68 tall, but his dick was 21 cm. long. And a few Months ago I sucked an about 30 years old man with a large 23 cm. cock. And the guy was also quite short, max. 1,70 tall.
I have also had a 1,95 cm tall blond guy whose dick was only 15 cm. (6 inches) long. But the thickest dick I have sucked belonged to a 2.03 Danish guy. His cock was 19-20 cm. long, but also about 18 in circumference.
If you are interested, I may consider posting all my statistics later on, so you can see "proofs" of what I say ;D