There was a "Seinfeld" episode where George had dropped his bathing suit in his room in the Hamptons, and Jerry's girlfriend saw him naked. His dick had shrunk. George complained that he had been in the pool, and that the cold water had shrunk his dick. She laughed because his dick had become microscopic.
Later, during the show, Seinfeld said that penis shrinkage was like "a frightened turtle." Very funny!
Seems, in retrospect, NBC would not allow the use of the term "dick."
I'm wondering if Larry David had used the term "penis" while in Brooklyn, before he became a superstar, while he was in Sheepshead Bay High School (we graduated the same year and same school). I doubt it. No one I know used the term "penis," at that time, as far as I know.