My former coworker is straight. I think she'd move in different circles than what you're describing.
When did AIDS get into the non-drug-using straight population in the US to a large degree?
I'm not in the US and not familar with the data, I live in the UK and I'm currently visiting Australia.
In the UK, what some of us sarcastically call good AIDS (i.e. not gay, not drug-using, not sex workers) is fairly uncommon. It is mostly confined to immigrant groups from sub-saharan Africa. Amongst the longer-term population, even the worst blackspots are in the 1 in 5000 category. Heterosexual transmission is actually now the main vector in the UK. The stats are at http://www.avert.org/uk-transmission-route.htm.