Every now and then, a storyline in a TV show or movie will involve a third party engaging an escort to provide companionship to someone else. Sometimes, it's a friend (or friends) being a friend (or friends) to a friend (remember Renko in Hill Stret Blues and how pissed he was when he found out it was his friends' money and not his charm, that landed him that gorgeous babe?); sometimes it's a businessman trying to seal the deal; sometimes, similar to a scene in MASH, it's to set up the other party or embarrassment or blackmail.
I'm sure this sort of stuff doesn't happen often, but I'm also sure that there's a story or two out there waiting to be told. Anyone?