Can I ask you (approximately) how old you are?
My experience is similar to LuxLawyer's - a lifetime of having the "risky sex = AIDS " drilled into my head. AIDS entered the public eye at roughly the same time I became aware of public issues (I remember as an 8yo in '85 taking a ribbing for thinking someone was talking about "aides" - like the teacher's assistants). By the time my cohort reached sexual maturity (roughly '91), it was largely seen as a fatal disease and had made the jump from a niche disease to a widespread public health threat. As such, I think it primarily defined the risk of sexual activity for my generation.
I don't remember exactly when the first cocktails came out. But, I think it was around '97 that people began to see it as a manageable disease rather than a speedy killer. As time went on, the rumor was that the kids coming up under us didn't have any real fear of AIDS - that it was seen as unlikely and survivable.
If you're younger than myself, I'd be interested to hear your thoughts on how you think your generation's perceptions might differ.
I've figured every generation manages to convince itself of two unshakeable truths--(1) the kids today are twice as depraved and foolhardy as we ever were; and (2) the kids today are half so inventive and rebellious as we ever were. Thus, most of the talk I've taken for the sort of BS by which a social group defines itself through exclusion ("we" know a more essential truth about sex than "they" do). But it would be surprising if there weren't differences based on context.
On a purely anecdotal basis, having lived in San Francisco, I've known and worked with a lot of HIV survivors. A surprising number of them seemed to hit some kind of "10 year wall" on their medications regime - when their cell counts started dropping precipitously and they began falling ill to opportunistic infections (i.e., they began developing full-blown AIDS again). I hope we don't see a spike in the transmission rate among kids in their teens and twenties (though I've heard we already have). The drugs are still too new to know for certain their effectiveness over time, and sub-Saharan Africa shows how serious a sexual epidemic can ultimately become.