As the name implies, penis captivus occurs when a man’s penis gets “stuck” in a woman’s vagina. This is extremely rare in humans (more common in some animals) and usually lasts only a few seconds. But it can happen. It’s believed this phenomena may be caused by contractions of a woman’s muscles during orgasm. The vagina is lined with muscular ridges and when some women orgasm these contract, which can presumably cause them to clamp down as well.
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