As someone who has been a call girl (many years ago), I must say that you are a jerk. First of all, would it have been accpetable if she were to badger you about whether or not you had showered? A lady is still a lady regardless of her profession.
You asked her to perform a service without a condom, yet you worry about cleanliness? Even if she had showered 5 times that day it would not change the fact that she may be carrying STD's. Of course in my expierence hookers or call girls have less incidence of STD's than do club and bar girls. Most brothels or escort services require their workers to always use protection and to have quarterly or even monthly checkups. Chances are good that she was cleaner than you.
Personally if I were in the act of oral copulation and you asked me for the second time if I had showered, I would have stopped, left, and found a bodyguard to let you know that you were no longer welcome at that establishment. And I would have kept your money as payment for your abuse.