I think, most men want a bigger cock, but only because having a big cock is such a mental plus for your self esteem, unless its that large that it causes problems in sexual relationships, then it can be a bad thing because the person becomes some kind of sex object, where people don't really care about you, they just want the novelty of doing it with a guy with a big cock, strangely thats mostly women.
So there is a plus and minus on both sides
Not that it will ever be an issue for me either way
Just to balance the books up, from a gay point of view, really big ones don't do anything for me, so about average is fine
For all the guys out there that want to know, because it really is a "big" issue for some, if you excuse the pun, average is 5 to 7 inches long and 3.5 to 5.5 inches in circumference, easily measured witha piece of string and a ruler, shorter guys at the lower end of the scale, taller guys at the upper end of the scale, from 5ft 5" to 6ft 6"
Although you do have to say, if someone asked you to take part in a study for this type of thing and you had a small one, would you really take part, so there is some question if the real world numbers are actualy lower than that.
From my point of view its the finished article that matters, not the tools you use to make it, being in truely in love with someone is far more sexualy exciting than how they measure up.
PS. While I think about guys, don't be fooled by porn, there are a few tricks that are pulled in that field of work to make it LOOK bigger, like trimming the pubic hair all the way back to the body, using a different type of lense and mechanical aids