Discrimination has lead to an underground culture that is still ingrained in the gay community, of promiscuous sex etc.
Also since civil ceremonies are illegal in many states then people cannot even form long term relationships on the same level as the straight population, there is no incentive either financially or legally in some cases to change their culture, although they have to reflect AIDS; mind you the heterosexual population hasn't, which may explain why it's catching up and will if trends continue far surpass the gay community, world wide of course it did that ages ago, and is soon to become a disease that is more prevalent in women.
This is not good enough, it is this sort of discrimination that has lead to the gay community adopting it's practices in the first place. Driving it underground making it sinful and illegal.