I think a reality check is in order here.
Sex with a working lady is essentially living out the fantasy of having your wicked way with a lady who, in the real world, probably wouldn't give you the time of day or, at least, would need quite a bit of pursuit.
A good working girl, one who cares about her work and her clients, will play along with this and be whatever she believes the client wants. Ladies are much more intuitive than men in this regard and can easily find and push the right buttons to make the experience memorable.
Such ladies are solid gold and in my punting career I have only found a handful - by my reckoning they account for less than 10% of the "market". The only similarity they bear to a "girlfriend" is that they put in the effort to make the encounter special and leave the punter feeling great about himself and the world in general which, after all, is what recreational (as opposed to procreative) sex is all about.