As a mathematical exercise, I’ve seen estimated HIV transmission rates somewhere between 1:10,000 and 1:900 (or 1:10 based on some study in Africa of high viral load carriers) and using the 1:10,000 figure, a man who had sex with ~150-200 HIV positive partners would have a ~1.5-2% chance of contracting HIV, which is similar to the risk of dying in a car accident in your lifetime. I can’t speak for the guys who have sex with the proverbial crack-whore type of girls, but I think it’s a reasonable assumption to say that frequent long-time hobbiests that seek out level-headed escort will not run into a meaningful number of HIV positive girls in their lifetimes - let alone ever contract HIV - unless they’re having sex with prostitutes in high HIV countries in Africa (for example). Personally I’m not aware of any person - provider or john – claiming to have contracted HIV on any of the escort message boards but, then again, those unfortunate individuals may choose not to advertise their situation for many reasons.
As someone who appreciates the hobby, I can only say that I try to be reasonably careful to mitigate my risks of ever contracting an STD but understand that just as someone wins the lottery ever so often, there is someone who draws the unlucky short straw.
11/20/2011: BPEL: 6", MEG: 4.75" (goal BPEL: ~7", MEG: 5.25")
5/9/12: BPEL: 6.5", MEG 5" (goal BPEL: 7.25", MEG: 5.5")
3/5/13: BPEL: 6.875", MEG 5 5" (max goal BPEL: 7.5", MEG: 5.75")