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Yale Researchers Reveal Secrets of Duck Sex: It's All Screwed Up [View all]
Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart oppositely spiraled males.
https://news.yale.edu/2009/12/23/yale-researchers-reveal-secrets-duck-sex-it-s-all-screwed?
((Read below for 'screwy' details!))
2 replies
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