Hey, I have been wondering for a while what the large "vein" is called on the under side of the penis when you are erect. The reason I have been wondering is because when I get an erection mine is not very visable. My penis is not small (about 7.1 by 5.2 inches) so I was wondering why it does not show as much as I have seen on other erect penises. On most I have seen it is very visable and what concerns me is that mine is hardly visable at all. I drew 2 very crude 3 second drawings in paint so you guys can get a better understanding as to what im talking about. http://i128.photobucket.com/albums/p196/hiro321/question.jpg http://i128.photobucket.com/albums/p196/hiro321/side.jpg Thanks for your help.