(HealthDay News) New research pinpoints a major reason why gay and bisexual men remain so vulnerable to the AIDS epidemic: When it comes to the transmission of HIV, a man who has unprotected anal intercourse is at especially high risk.

In fact, if that kind of intercourse was only as risky as vaginal intercourse, researchers report, HIV cases among gay and bisexual men would shrink dramatically. It would go down even more, they added, if their rates of casual sex declined.

The reality, however, is much different. “Everywhere we looked, HIV is expanding both in high- and low-income countries among men who have sex with men,” said study author Dr. Chris Beyrer, director of the Johns Hopkins Fogarty AIDS International Training and Research Program.

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