I'm such a shit.
I had a punt a few years ago and the girl didn't ask for the money upfront. We had a great fuck and when we'd finished, she left the room while I got dressed. While I was waiting for her to return, I noticed a small pile of cash on a shelf in the room. I picked it up to count it, the exact amount I owed the girl for what we'd just done. (the last punter's fee, no doubt) She walked in as I was counting it, held out her hand and said "Thanks Hun" took the cash and kissed me on the cheek. I grinned, left discreetly and drove off, feeling a mixture of guilt and elation that I'd just had a very good free fuck!