is part of a discussion in the Sex With a Large Penis forum that includes topics on Real-life experiences, techniques, pros and cons, injuries, masturbation, etc..
Diameter varies depending on which dimension is measured, at which point in the shaft. Though I was surprised, based on my visual impressions, that it didn't vary more when I measured:
Is this a non-sequitur? Diameter is the through measure of a circle, sphere or cube. The cross section of a penis is an ellipse and therefore there is no true diameter: though two differeent cross measures. Even taking the circumference and making an hypothetical diametre would not give you a true diametre of a penis.
The only valid comparison beyween penises would be by comparing volume and even that index is not 100% accurate.