I was amazed that my SMDB search on penis captivus turned up empty!
In this unsubstantiated phenomenon, severe vaginal spasms trap the penis. In extreme cases, it is reported by less-than-repuatable sources, the couple, still coupled, had to resort to a trip to the emergency room to free the penis, even after it had become flaccid.
I literally got bitten by this question.
Bitten by a dog that is.
We had two dogs copulating out on the lawn in the backyard.
The larger one (doberman?) had mounted a poodle and couldn’t get free.
The poodle was struggling madly and in obvious pain and the larger dog was livid.
All the neighbors were watching and shouting things to do, but not daring to do it.
It finally got free and left after about five minutes, and the poodle was walking on just her forepaws and dragging her legs.
Her back had been broken in the struggle.
I went to pat her while someone called animal control, but it was confused and bit me in the hand.
So animal put the poodle out with a hypo shot and gave me a lift to the emergency room.
The idea of human Penis Captivus is a complete fabrication.
In 1884 Dr. Sir William Osler, writing under the pseudonym of Eggerton Y. Davis had a letter to the editor published in th Philadelphia Medical News. His letter was a tounge-in-cheek response intended to ridicule an earlier article on Vaginimus (vaginal spasms.)
Unfortunately the letter was taken seriously and picked up by the Canadian Medical Journal and the Surgical Journal.
From there it garnered interest in the popular press. Like any urban legend it gained credence and popularity through repetition.