Differences in sexual behaviours do not fully explain why the US HIV epidemic affects gay men so much more than straight men and women, claims research published ahead of print in the journal Sexually Transmitted Infections.

HIV infection is on the rise among young men who have sex with men (MSM) in New York City, according to preliminary data from the Health Department.

Discrimination and lack of medical support have led to alarming rise of new HIV infections among men who have sex with men in developing countries, a leading American AIDS research group said Tuesday.

Gay and bisexual men may be at far higher risk for eating disorders than heterosexual men, according to a study conducted at Columbia University's Mailman School of Public Health. In the first population-based study of its kind, the researchers found that gay and bisexual men have higher rates of eating disorders. The findings are reported in the April 2007 issue of International Journal of Eating Disorders.