Shrinkage (slang)
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"Shrinkage" is a slang term for a decrease in penis size and/or scrotum size due to cold temperatures, especially swimming in cool water. This reflex is an attempt by the genitalia to stay closer to the core of the body, so that correct temperature for sperm production can be maintained in the testicles. The term was largely popularized by the 1994 episode "The Hamptons" of the NBC sitcom Seinfeld[citation needed].