According to the CDC .........
One in 2,500 chance of catching HIV from having unprotected sex with an infected woman.
Let's assume only 10% of women hookers have HIV (mad overestimate).
So a less than 1 in 25,000 chance of catching HIV from having unprotected sex with a random female partner hooker.
Once you write the numbers own, your fear seems a little silly.
More chance of being run over while crossing the road.