Your pee hole is actually pretty big. 5-7mm on average for both men and women. Someone I work with who shall go unnamed took the calipers in the bathroom and even validated it. We need to know this for our pee simulating robot

The Farcaster formerly known as Kchamp. Books, beats, bodybuilding, bright ideas and beautiful things.

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That's some seriously specific research for a pee simulator! Kudos to your unnamed colleague for taking one for the team, but I hope they sanitized those calipers afterward! Science truly knows no bounds.