Forget about HIV, chances of transmission are low.
BUT WHAT ABOUT:
- Herpes Simplex Virus
- Syphilis
- Human Papilloma Virus
- Hepatitis B and C
- Molluscum Contagiousum
Remember this:
TO GET INFECTED WITH THE ABOVE, YOU DO NOT NEED BLOOD ON BLOOD TRANSMISSION.
And remember this too:
SIMPLY FLOSSING TEETH WHICH CAUSES MICRO TEARS IN THE THE GUMS OF THE MOUTH AND THEN PERFORMING ORAL SEX WITHOUT PROTECTION HAS BEEN SHOWN TO INCREASE YOUR CHANCES OF BLOODBORNE PATHOGEN TRANSMISSION.
If you think I am lying to you then look it up, but I do work in healthcare and I know.
your friend should start getting bloodwork and repeated work.
Never go without a condom and stay far away from high risk persons such as those in the sex industry who have many sexual partners.
As for the prostitute, you are correct, no one cares about her. And that in itself is a clue that she will not be getting the proper testing and could become infected with any of the diseases mentioned and be passing on to your friend for sure.
Good Luck.