I think you make a bunch of assumptions about prostitutes here. First, you assume that prostitutes are female, which only about half of them are. Second, you assume that prostitutes are willing participants, which again, only about half of them are.

Lastly, you seem to assume that how a prostitute acts and feels are synchronicity, but they aren't. Just because a prostitute doesn't act like a client isn't a disgusting piece of crap, doesn't mean that they don't think or feel that client isn't a disgusting piece of crap. It's just like when a waiter or waitress smiles and tells you what a pleasure it was a pleasure to serve you when deep down inside they're hoping you roll of a cliff.

Don't confuse people's actions when being paid with their true feelings and intentions.

I hope that helps clear things up. Cheers.