a few points to make. most hookers have pimps. and its the pimps you have to convince..not the hookers.
secondly hookers if elite escorts can make thousands an hour for laying on their back.. in the online world most webcam shows have tip jars, and if you actually look at the prices, most viewers tip pennys which even with hundreds of viewers do not come close to the amounts that some street walkers can earn.
the only benefit to hookers are the 'dirty and cheap' hookers who charge $£10 for most services, purely to get their drug addiction costs met, and most of those hookers are too wasted in the head to conceive the economics of bitcoin. but their pimps may.
so the way to achieve success in your little project would be to talk to the pimps of the cheap and nasty hookers, tell him to buy a few raspberry pi's and cheap webcams and set up his group of girls in rooms to play out viewers commands inexchange for donations.
if anyone thinks my opinion is totally wrong, then i guess its because i am just talking about a theory i have no practical experience of, as i have never needed to pay for such things. i think there will be opinions/idea's from more experienced people in this industry