Pearl(y Mae) Bailey did some recordings in the '40s and 50's that were covers of pretty basic popular songs from the jazz and bebop and musical-theater worlds. They seemed innocuous enough to be played on the air. But my mother could hear some of the intonations that made some lines double entendres. She would hoot and start to laugh. When I first saw this, she would try to explain by demonstrating how Pearl might be standing and moving to produce some tones and sound effects. (Mom had seen the marvelous Pearl B. several times live in clubs.) I was about 12 and 13 or so--the beginning of the enrichment of my lifelong sex ed class. Also, listen to some of the covers of seemingly innocuous pop songs done by Louis Prima (and Keely Smith)--as well as their clearly "blue" stuff. FotFLMAO stuff for sure.