Six inches is the average if you allow for the half to full inch (or more) that most guys add to themselves online. I seem to recall that 5.5 was closer to average (worldwide).
According to statistics, less that 2-3% of the entire population of men have over 7 inches.
Size is also a perceptive/subjective judgement. One person's giant is another persons average...
Close up pictures vs. Cock pics with most to full body.
Most cocks look big in a close up- up the crotch shot, which represents like 90% of all cock pics/cams. (and it makes most guys look fat BTW../cough)
I've clicked on so many cams where the guy is like, "I'm 9 inches", and then I'm looking at a close up cam where the guys hand width covers over 3/4 of the fully erect cock, and I'm thinking what you have 6 and 3/4 inch wide hands?
My hands are pretty big, and my hands are 3.5 wide.
Pics that show the cock and most of or all of the body are sometimes hard to gauge without knowing certain other things...the guys height and thickness for example.
A really thick 8 inch cock will look "average" to a bit above (at least to me)on a guy whos like 6'2 or taller in a full body pic.
A 6 inch cock looks huge on a guy whos 5'3.
I'd agree that small is 5.5 or less, unless it VERY thick. Volume accounts for a lot.