Considering that the vagina is designed to stretch so much that another human can pass through it, you'd think it could easily fit any size erect penis. At rest, the vaginal canal measures 3. But when you're sexually aroused, it elongates, lubricates, and expands—so even sex with an XL guy is slippery and comfy. The average erect penis comes in at 5.
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Penis captivus allegedly occurs when a penis becomes stuck in a vagina during sexual intercourse. Reports of this happening are incredibly rare. Very few reports have documented the existence of penis captivus. What reports there are have led many people to question whether it really happens. The penis becoming stuck in the vagina is one possible outcome of a condition called vaginismus , in which the vagina involuntarily closes due to muscle spasms in the pelvic floor.