I don't know about that either. I just read a UN report which dramatically reduced the number of AIDS victims in Africa, because they realized that they were attributing AIDS to all kinds of diseases that weren't AIDS.
www.cdc.gov
In 2005, there were 17,230 new cases of AIDS in the United States from male-to-male sexual contact. Another 8,381 came from intravenous drug use. 2,018 came from male-to-male sexual contact AND intravenous drug use. 12,388 came from "high risk heterosexual contact", defined thus: Heterosexual contact with a person known to have, or to be at high risk for, HIV infection, including hemophilia, blood transfusion, perinatal, and risk not reported or not identified. And the last 523 came from "other".
So 523 out of . . . what . . . 40,000 or so? 1 in about 70 new AIDS cases in the United States are from heterosexual contact, or from indeterminate causes?
Which means that I, as a straight, non-intravenous-drug-using male who isn't sexually involved with a hemophiliac and not living in Africa, has a greater chance of developing breast cancer than I do of getting the HIV virus. And if you don't know, I'm simply not worried about breast cancer.
Most straights know this, and if you want to know why we are so insouciant about it, that's probably why.