It's pretty easy to get the diameter of your penis. Stick ruler perpendicularly to the tip of your penis, measure the width of your head, adjust a small amount if the girth of your penis is smaller/thicker than your head. Times by 3.14. Bam circumference. Most men dont have that clothing ruler thing that tailors and shit use and are too lazy to use something like a piece of paper to measure their dick.
XI Wiki



