In the Seinfeld episode "The Junior Mints" Jerry is going out with a girl whose name he can't remember, who tells him that it rhymes with a part of the female anatomy. Later we discover that her name is Dolores. What body part does that rhyme with?
Clitoris, though it only rhymes with a specific pronunciation (cli-TO-ris instead of CLI-toris). It's discussed on the episode's Wiki page which also explains George's bizarre name suggestions (e.g. Loleola) and includes this little tidbit:
According to the "Inside Look" from the DVD, the writers had trouble coming up with a name for Jerry's girlfriend, initially settling upon "Cloris". When filming the episode, a comedian would warm up the studio audience in between filming scenes and asked them to guess Jerry's girlfriend's name; one audience member guessed Dolores, which was deemed a better fit than their first choice. Jerry Seinfeld approved in time to add it to the script and the scene was shot with that being the character's name. Afterwards, a producer for the show was amused to overhear the audience member's husband saying "you guessed right!"