Penis captivus

• abstract: Penis captivus describes a rare occurrence in heterosexual intercourse when the muscles in the vagina clamp down on the penis much more firmly than usual (a form of vaginismus), making it impossible for the penis to withdraw from the vagina. According to a 1979 article in the British Medical Journal, this condition was unknown in the twentieth century, but a subsequent letter to the same journal reported an apparent case of penis captivus in 1947.

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