The concept was made popular in the Friends episode 'The One with Frank Jr.'.
Chandler: Does anyone else think David Copperfield is cute?
Monica: No, but he told me he thinks you're a fox.
Chandler: All right, Janice likes him. In fact, she likes him so much she put him on her freebie list.
Joey: Her what?
Chandler: Well, we have a deal, where we each get to pick five celebrities that we can sleep with, and the other one can’t get mad.
Ross: Ah, the heart of every healthy relationship. Honesty, respect, and sex with celebrities.