One-Third of HIV-Infected Gay Men Have Unsafe Sex: CDC

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Black gay or bisexual men were also "36 percent less likely than whites to report having as many sex partners as white MSM," he added. Blacks in the study were also less likely to use recreational drugs, such as methamphetamine or cocaine, compared to whites.

Other studies presented at the teleconference showed close correlations between recent spikes in syphilis and gonorrhea among gay and bisexual men and rates of HIV infection in this population.

And, in a finding that puzzled experts, another study showed that circumcision -- long thought to reduce HIV infectivity -- does not help shield black or Latino men from the virus.

All of the new statistics confirm that much more must be done, the experts said.

"This shows that prevention messages have to be continually refreshed, and responsive to those who are younger," Mayer said.

More information

There's more on HIV/AIDS at the U.S. Centers for Disease Control and Prevention.