She doesn't need to provide bareback to make good money. So she either really gets off on it or is intentionally looking to becoming HIV positive. A morbid, gross thought. Or not saying she is but she might not have anything to loose. No accusations. Just saying it could be a possible motive.
As some people have pointed out earlier in the thread it can be quite hard to get it. But taking multiple shots up the arse is a very good bet. She will have to go for a while but she'll make it, I'm sure.
I got these figures from a blood borne virus specialist (health professional) about 6months ago.
These are the odds if you are the recipient of the semen and assuming the donor is already HIV positive:
1 incident of semen directly in the vagina- 1/300
1incident of semen directly in the anus - 1/30
If you are the donor and the recipient is HIV positive
1 vaginal unprotected fuck 1/1000
1 anal unprotected fuck 1/800
Now not sure how many people are HIV positive in the uk but its fairly low. And fucking a lady who may have semen still warm in her holes from previous fucks probably ups the chances. As for getting a wide variety of other yummy diseases, chances are very good.
As long as everything is consensual then good luck to all who sail in her as you'll need it