Circumcision is unlikely to be an effective HIV prevention strategy among men who have sex with men (MSM) in Britain, according to a study published in the Archives of Sexual Behavior. Researchers examined the association between circumcision status and self-reported HIV status among MSM in Britain who mostly engaged in insertive anal sex. HIV rates were similar for circumcised tops (8.6 percent) and uncircumcised tops (8.9 percent). Tops are generally at lower risk of HIV than bottoms, but both are at risk.

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Editor's Note: This article has been updated.