On Saturdays WBUR airs a show called The Splendid Table, "the show for people who love to eat".

The last portion of the show is a call-in session. I've never called a phone sex line, but listening to the callers, it seems a lot like what I'd imagine it to be. The caller (or the host) will describe how to prepare something in loving detail, and the other would respond enthusiastically.