Actually, that does not appear to be precisely true according to this article and, until the agenda-driven science is removed from the equation, it is unlikely that the truth will be known.
The article you posted seems to be agenda driven.
I made my points as comprehensively as I could, and I stick by them (as do most scientists). As for 'agenda-driven' science, well ....what would you call the article? Again, the only difference between this article and the others is that the people in it have REAL (for a change) scientific credentials and are not delving into water-dousing. Which is refreshing, even though they are a very small minority in the scientific realm (especially when you take out the kooks and politicians). As for 'ageng-driven science' just remember that 'agenda-driven' goes both ways and cuts both ways. I'm not saying the article is agenda-driven, but at the same time i am not saying it is not! It does quack like a duck though, particularly when the guy starts 'guessing' and making up statistics. But hey, he could just be overly passionate and exuberant.
Anyways let me add this. In the West the viral spread has a different dispersal and nature than in the 3rd world. And here it has a storng link to homosexuality (and most of the infected either have a direct or indirect link to either gay partners, 'hetero' partners that have gay linkages somewhere down the line, or intravenously delivered drugs). Even the demarcation of infection shows a difference (eg in Africa there are more women infected than men; but in the US the rate of male infections to female infections is 3:1, primarily due to gay male epicenters). The focal epicenters are very different.
Anyways believe as you will, and I will as I do. I do know, having spent 18 of my years in Afric, that things like homosexual sex are anathema. I also know of studies (some lasting 10 yrs) on HIV spread (and anal sex was actually studied, with it being found in tourist areas between mostly European tourists and gay prostitutes). The vast majority of infections were due to stupid heterosexual contact. Infected needles were found to comprise a small percentage of infection (around 2.5-3%) in the last decade. Gay sex, while a bane in the west, is simply not sizeable to even account for a fraction's fraction of the sheer number of cases running rampant.
Anyways, have a great day and God bless.