As a community, we don't discuss the subject because HIV bears a very similar stigma to that cancer had 50 years ago. HIV is still seen as a gay disease while that really isn't the case. There is so much shame attached, with most of it rooted in religious beliefs when the gay factor is added. Getting tested is more frightening than living with the disease because it forces one to face mortality. Education is lost because the shame hinders discussion. Black women are the fastest growing segment of the population contracting the virus from men who also have sex with men and who can't deal with that added sexual dimension of themselves. There are other less frequent causes such as IV needles, etc. The current express trend in sero-converting populations is found among young black men who are inadequately prepared for their sex lives and conduct those lives with unsafe practices. Again, this is due to lack of education.
My guess is that lack of education and dialog are the two largest factors contributing to the alarming rate of HIV growth in the population.