In order to determine the circumference of your erect penis, determine the point of maximum girth and wrap a flexible tape measure around it as illustrated to the right. This subject's maximum erect circumference measures 130 millimeters. (Remember, if you don't have a flexible measure, use a piece of string or a strip of paper, and mark off with a pencil the point of overlap. Remove the string and place it alongside a ruler to determine your measurement.)

 

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