Yuan T, et al. - All available evidence on the correlations between circumcision and HIV and other sexually transmitted infections (STIs) in men who have sex with men (MSM) were reviewed to inform global prevention strategies for HIV and other STIs among MSM. They reviewed in total 62 observational studies including 119,248 MSM, which suggested a possible benefit of circumcision in protecting MSM from HIV infection, particularly in countries of low and middle income. Herpes simplex virus (HSV) overall and penile human papillomavirus (HPV) infection among those infected with HIV were also noted to be less likely among MSM with circumcision, suggesting its possible benefit against these infections. Findings stress including MSM in campaigns promoting circumcision among men in countries of low and middle income.