Don't know too much biological information on this, but I was wondering if anyone knew what factor(s) contribute to how much a penis will curve when it's erect. Is it an arrangement of the corpal bodies in the penis? Is it influenced by the PC muscles? Does length or girth play a role? I have noticed that the few guys whose dick I've seen have had these wicked curves arching up toward the stomach or to either side. Mine, on the other hand, is pretty rigid and straight up-and-down. If there is any curvature, it's hardly noticeable. If I'm sitting or standing, when aroused, it juts out prominently at about 45 degrees.