I wouldn't say this is why I go to RNT over FS, but one of the advantages of RNT is that I don't actually have to fuck the girl that I book if I didn't feel like it during the session.

As crazy as it sounds, sometimes I take a punt on a new girl and something about her just puts me off completely. Then I'm stuck there not actually wanting to have sex with her. If it was an FS place, it becomes a real chore. I'd be forcing myself to go through with it because I've paid for sex. The worst punts, I couldn't even finish... Just zero attraction there.