First thought:
Last time I checked, if you don't have sex, use IV drugs, or get a blood transfusion your risk of getting HIV is pretty much nil (HIV babies notwithstanding). So regardless of all the studies in the world, the reality is that abstinence until marriage by both spouses lowers one's risk for HIV to just about one in a million. I'm not trying to moralize, it's just a fact.
Second thought:
Duh! Abstinence apart from a larger moral framework and worldview is untenable. Think about it. Just going around telling people not to have sex isn't going to work, because , as you may have noticed, the human urge for sex is pretty strong. Only food and water rate higher in most people's books.
Abstinence and other virtues are heart issues and programs don't change hearts. Programs might get us whipped up, the way we feel patriotic during the national anthem at the ball game, but unless there's genuine moral fiber - character and a heart attitude that is predisposed towards a given virtue - we'll give in to the draw of instant gratification. (I speak from copious experience/failure on this one...).
Abstinence-only programs do not reduce HIV risk - Yahoo! News
