Good question you raise gambit... and one that has been previously raised... never the less, no reason why we can't debate this very interesting subject again.
The answer is that some do...some don't.
Most 'working girls' adopt a different 'working name'.... and most girls adopt a different 'persona' when they are 'on-duty'.
Those that are really capable of distancing themselves from their true 'self' seldom, if ever, orgasm with a paying client, but will 'role play' an orgasm hoping it will make the guy cum quicker.... But I am generalising here... and, of course there is...and always will be... a few exceptions here & there... and they will have a totally different story to tell.
However, every now and again, a certain client will 'click' with a particular girl...and when that occurrs she sometimes has difficulty keeping up the 'role play' and will 'let her guard down'...and enjoy the moment.
A few years back, I knew a girl, then in her late 20's, who had worked on/off in the Industry for a couple of years and was working a couple of nights a week at Club 316 just to supplement her income and get some regular sex...without the complications of a relationship.
I was many years her senior and a sort of 'mentor' to whom she turned...now and then.. for advice when 'issues' arose.
This girl adopted a different persona whenever she worked....and would never permit herself to orgasm.... but on occassions...like all girls she just has to let herself cum... I always knew when she reached this point as my mobile would ring about 1am (her 'knock-off' time) and she would ask me ... "Are you home?...are you alone?...can I come over to see you?"... Whenever I said 'Yes'... She would say "Ok, I will be there in 20 minutes"
On such occassions, which were perhaps every 2nd or 3rd week... depending on her hormone activity... immediately I opened the door, on her arrival, she would throw herself at me...hug me tight and say... "Please feed me and fuk me... I'm so hungry and horney and I desperately need an orgasm"... She would stay the night...during which she would tell me about a particular client..who was an adonis... and who had fuckt her so arousingly that she had been fighting to hold back her orgasm... but now just wanted to explode on someones cock..who was not paying to fuk her.... of course I was always most willing to allow her to get off as she rode my cock... but I am sure, that within her mind...at her moment of orgasm...was that 'adonis' who had just hours before been her client.
Now there is a way to determine if a Woman is genuine or faking... most who fake make a lot of noise... but look for the true 'tell-tale' signs.... their breathing and their hands and their skin tone... When a girl is reaching a natural orgasm her fingers will begin to tighten and her hands will claw at objects...like sheeets, pillows or any secure 'fixed' object within her reach....and her breathing will change... another sign is increased blood flow to the upper torso... this can be observed (if there is light) by the skin on her upper chest, neck and shoulders increasing in redness.... right up until she reaches that explosive moment... when she will relax her muscles, release her grip, her breathing will return to normal and the redness will retreat from her upper torso.... when you observe that in a girl you know that she has just orgasmed on the end of your cock... and YOU may now 'explode' inside her!
Hope that helps those who may not be sure... Sir Stefan.