For once, the answer to a question in the headline is, "Well, quite possibly."
It's been 100 years since a well-documented case of penis captivus — i.e., penis-stuck-in-vagina syndrome — appeared in the medical literature. But that doesn't mean it's a total myth. The BBC's Health Check discusses the physiological mechanisms that could lead to such an unpleasant event and explains why there are lots of anecdotal stories surrounding something that's thought to be "vanishingly rare" from a medical perspective. Hint: While very, very, very few people end up needing medical treatment for penis captivus, there may be many more who get temporarily-but-disconcertingly stuck for a few seconds.
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From Retraction Watch
: The Indian Journal of Surgery has retracted a 2011 paper entitled "Penile Strangulation by Metallic Rings". The reason: The authors apparently self-plagiarized the report from an earlier 2005 paper. Please insert your own jokes here.
First: When shown images like the one above and asked to choose which men they found more attractive, women cared significantly more about body shape than penis size. (Also, it's worth noting that the image above is meant to show you an average, actual human guy in the middle and the extremes of body shape and penis size that were shown to the women on either side of him. In reality, the women were shown a full spectrum of images mixing different body types and penis sizes).
Second: The hypothesis (that human women sexually selected human males to have the larger-than-other-primates junk they are blessed with today) comes with some big questions, including the obvious — flaccid penis size does not correlate well to erect penis size.
Third: As Faye Flam points out at The Knight Science Journalism Tracker, the journal Proceedings of the National Academy of Sciences might need a new acronym (or, at least, different subject matter).
Here's a link to the actual study