hotbodz8: It would seem that the theory of relativity would play alot into this. If you take say two, 7x6" dicks and put one on a tall lanky dude and the other on a shorter and broader body builder of course the dick will look bigger on the taller lankier dude. Especially thicker. Why? Well the longer appearance because anything on that frontal plane of the body of a taller guy is going to look longer. As far as thick, if the lanky guy had a typical 21-24" circumference thigh that dick is going to look a lot thicker than the bodybuilder whose thigh "sweep" is going to be broader and whose thigh might measure above the 26" mark in circumference. You would have to actually physically measure a random sampling of taller and thinner, and shorter and stockier guys in order to get a more accurate look at that theory
I, myself am definitely an expception. I'm 5'9" 210 lbs. and have an 8.5 x6" dick, so I'm far from being Wilt Chamberlain. and like bigmike11, I'm a bodybuilder. And also, with about 27" thighs, my dick, though it looks thick on me, would probably look thicker on a guy about 3 inches taller than me and about 40 lbs. lighter than me.