My doctor told me one time that if a man had sex with a woman that WAS HIV positive without using a condom there was still less than a 1% chance that the man would become infected. If you bag your willy the odds drop almost to nothing. And that's assuming that the woman was confirmed to be HIV +. Now factor in the odds of a woman actually being HIV positive and your odds keep dropping.
While looking at the Center for Disease statistics broken down by risk factor AIDS in the USA is almost exclusively among gay men and IV drug users.
I've read where things are totally different in Africa socially. Prostitution is every where and it's common for men to have 5 different partners in one week. Condoms are not considered "manly" and aren't used. Some hospitals don't even test blood samples before transfusions.