I do believe there are some girls who genuinely enjoy being a whore, whether it's because they like sex, a particular punter or any other reason.
I used to visit a parlour that always had 2 girls but only 1 room, so you may have to wait in the tiny living room (the maid would be in the kitchen). This one particular girl I went to see would always come into the waiting room with me and snog my face off or give me a blowjob while we waited for the room to free up. All this this before I handed over any cash and it never ate into my actual time with her. I can't see this happening unless she got some personal pleasure from it.