Anonymous AIDS testing and treatment will soon be a thing of the past in California now, thanks to the way in which federal grant money is allocated. While I understand the desire to ensure that AIDS statistics are accurate, I view mandatory reporting as a breach of civil rights, especially in the case of AIDS because of the social stigma that it carries. According to this article anonymous testing will still be available (though probably on a much smaller basis because federal funds are not available for anonymous testing), but if you test positive and seek treatment you will be reported. The health police are after you, friends.
I still recommend AIDS testing for all sexually active individuals on a yearly basis, along with a full STD panel. Better safe than sorry, kiddos.