i'm not sexually active, but i've long realized that i'm the one that needs to ask because the vast majority of people on this planet are irresponsible cretins.
the sad fact is that you cannot expect people to have the common courtesy to disclose, if it means foregoing the possibility of an orgasm. that's the sad reality of how people think in this utilitarian society. that's their cost benefit analysis.
if you have hiv then you should not be sexually active at all, and i'm sorry if you're too stupid to figure that out. but, i guess you were dumb enough to catch it in the first place, right...