Hate to burst the bubble, but no hooker enjoys what she does, it is just a means to an end. The most successful hookers though are brilliant actresses and so give the impression they genuinely love what they do.
It's clear, even from SAAFE, that some girls enjoy what they do some of the time. It's also clear that if a girl gets very very wet, and you've been with her, say, for a drink or meal beforehand, and there's been no chance to apply any lube, and their wetness has the distinct aroma of female arousal, that they are turned on. If a girl squirts in the session (it has been known), the chances are that some element of enjoyment has entered into the equation. A girl may not like you enough to shag you for free, although this happens sometimes, has in fact happened to me, once; but she might like you enough to have sex with you for money - because you're a decent enough chap, have some reasonable technique, are good company etc. Maybe if guys have beer goggles girls can have money goggles? Chemistry/ clicking can and does happen so I think it's daft to say that NO girl EVER enjoys what she does.