HIV/AIDS and relative risk in the gay/straight populations

HIV and/or AIDS sometimes lingers in the background of the stories on gay relationships, such as this NYT article which reflects mournfully on many past deaths. With much greater social acceptance of homosexuality in recent years has any of this changed? Looking at a CDC outline of the data on the topic (wherein MSM stands for men-who've-had-sex-with-men) the answer appears to be a fairly clear no:

Although MSM represent about 4% of the male population in the United States, in 2010, MSM accounted for 78% of new HIV infections among males and 63% of all new infections. MSM accounted for 52% of all people living with HIV infection in 2009, the most recent year these data are available.

So the greatly elevated risk of HIV/AIDS still seems to be there - if I'm crunching the numbers correctly the prevalence of HIV/AIDS is 50 times as high in the population of men who've had sex with men than amongst the rest of the population. (Per a CNN article citing an FDA source the increase in risk applies more broadly to infectious diseases not just HIV/AIDS, though it's unclear from my reading how relative risk compares for other specific diseases).

Canada now requires 5 years since the last male-to-male sexual contact for blood donations. Despite a large chunk of the comments on that article basically calling the policy homophobic and lacking scientific justification the CDC data does seem to show the continuance of a very real, greatly increased risk HIV/AIDS for the group. Just how long a ban is needed before tests can detect problems is another question - countries placing no limits on blood donations from men who've had sex with men seem to be only a small minority at the moment. The length of the period of abstinence required does vary from country to country though despite most often remaining an indefinite ban.