Apparently the human anus can stretch up to 5 inches in diameter (2.5 inches radius). A sharpie marker is roughly 11mm in diameter (.433 inches). Math shows weโre a long way from the max record!
(self) After browsing this sub for hours I bought a pack of 24 and can't wait for my girlfriend get home to start. What color should she put in my ass first? The anticipation is the best part...