Very unlikely that Ron was infected having sex with HIV positive woman..
...because HIV/AIDS is typically not passed that way. Sorry, I know it's not politically correct, but its a medical fact.
Unless there is a transfer of body fluids, typically blood, there are few cases of men contracting AIDS from AIDS infected women, including having unrotected sex with AIDS infected hookers.
The chances of a woman contracting AIDS from an AIDS infected man via vaginal sex is higher, but still not that high.
The way AIDS typically is passed is with anal sex, where semen is poassed from a man to a partner anally (whether that partner is male or female).
Of course another common way the virus is passed is by sharing dirty needles, where one user has AIDS and passes it to another user that way.
We were warned in the 1990s of an impeding AIDS epidemic among the general population via straight, unprotected male+female vaginal sex. That was a lie in order to create panic and increase funding for AIDS research. The epidemic never happened, because that is not how AIDS is passed.
I have been reading more and more articles by people who know Ron who suggest he was gay or at least bisexual and that is probably how he got it -- having anal sex with another AIDS infected male, not from having unprotected sex with an AIDS infected female.