The purpose of "Avert.org" the website linked by Don Firth seems to be to provide information on the transmission of AIDS/HIV and to deflect questions on homosexual practice and HIV/AIDS.
In their pages, they make almost no comment on the "elephant in the room" which is homosexuality and the link to AIDS, while devoteing pages to oft repeated advice on blood products, drug users and burgeoning heterosexual transmission.

The website appears to be run primarily as a PR machine for the "Gay Lobby" I would advise you all to spend some time going through the pages and make up your own mind about the content.
The statistics which they provide for Aids infection are flawed, in that although they admit homosexuals are the largest group, they fail to say that in real percentage terms, the difference is massive even allowing for the chance of a much greater volume of transmission among a vastly greater heterosexual population

There are plenty of good independent statistics available elsewhere on the web.