I'm just going to point out that HIV does not just come from anal sex. HIV is transferred through the use of dirty drug needles, through vaginal and oral sex, and even through accidental blood contact with cuts, it is also passed from mother to child during pregnancy and through breastfeeding. One of the main theories of how HIV came about is from /eating/ SIV infected monkey meat, while SIV itself is not harmful to humans, doctors believe ingestion multiple times in rapid succession is the trigger point at which the immune system fails and the SIV survives long enough to mutate into [the human harmful] HIV. If one wishes to be /truly/ informed AID's is actually refers to the /final/ stages of HIV (and most people are not very likely to want to have sex with someone in the AIDs stage of the disease, just based on "looks" alone.)
If one want to create a sex education program to teach kids about sex and STD's that's good, but to try to make it out like anal sex is the /only/ way to get HIV or that Homosexuality causes HIV is an uneducated platform for schools to take. AKA stop pushing to lie to kids in order to support a religious agenda.
That said, my only hesitation on divulging the /whole/ truth about HIV would be antiretroviral treatments... I find myself a bit on the fence if knowledge of such would feed into children's innate "invulnerable feeling" and cause them to not take HIV as seriously as it needs to be taken. I want to believe that simply telling kids how expensive that treatment is (around $28,500/year [that's like 40 hours a week@$15/h]) would counter, but kids do not really have a concept of costs; so it'd be similar in their minds to telling them that "babies are expensive" (around $22,250/year [like 40 hours a week@$14/h]).
I feel we have far better luck countering the "it won't happen to me" psychology by telling kids how much of a pain in the ass babies are, unfortunately, I don't think the side effects from antiretroviral treatments would qualify as "enough" of a pain in the ass in their minds. Thus I contemplate "omission" of these, and similar, medical breakthroughs in favor of similar "pain in the ass" scare tactics showing what AID's (and other STD's) do to the body (specifically images from third-world countries where the disease(s) run their entire course sans treatment, face images are likely the best deterrent as it feeds children's less developed "egos.") The danger there, is that an HIV carrier, especially one in the US, or on antiretroviral treatments, do not really "look" sick, so we need to be careful to explain those are final stages and that many HIV carriers "look" healthy.
Of course, looking at the long term, even STD's that do have cures should be avoided, so obviously even when we find a cure for HIV, we should still teach prevention of contraction [of all STDs] as part of sex education.