Hello,

Welcome to the Forum and thanks for your questions.  I'll be glad to comment.  Body slides/rubs of the sort you describe (the medical term is "frottage") are a form of masturbation.  There is widespread agreement by official bodies such as the WHO and CDC, as well as among experts that all forms of masturbation are essentially no risk activities, even when participants get each others' genital secretions (including vaginal secretions and pre-ejaculate) on each other.  What you describe was a no risk event, even if she had an STI (which is unlikely, most CSWs are careful and get checked regularly, particularly if they work at a place with a fixed address such as a brothel or massage parlor).   No penetration, no risk. From a medical and scientific perspective, there is no reason for concern and no need for testing although some of our clients choose to test for the additional reassurance that a negative test provides.---

Hi again,
I really appreciate your quick and detailed response even tough i have read many similar questions and your responses were more or less same. I admire your patience and you are really making people feel more comfortable. 
Thanks to you i am more comfortable but this doesn't stop my anxiety to raise again and again. 

I am 99% sure that there was no penetration. As it was only frottage but very strong frottage which makes me think if tip of my penis was inside the vagina (maybe 1cm) ...... I would feel if it was inside but wetness was so much. 

Heavy frottage is still frottage.  We receive many questions from clients who hypothesize that "maybe" penetration occurred.  In no instance has someone saying this has become infected, further supporting that penetration is had to miss.  No change in my assessment.  As for your anxiety, as I said above, if that is the case, get tested.  I am confident that testing will show that you were not infected.---