The risk of being infected with hiv by someone who doesn't carry the virus is obviously very small. Very few people have hiv, so you probably won't be infected if you have sex. That's how I read that quote, anyway. Are you saying that advocating never having sex with the same partner more than once would have been better advice for reducing the spread of STDs?

The unique thing about hiv is the high moortality rate (and cost of treatment). It makes perfect sense to reduce transmission before it becomes a true global epidemic.