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often referred to simply as anal sex, anal intercourse is sexual activity that involves putting a penis into an anus. An estimated 90 of men who have sex with men and as many as 5 to 10 of. Does anal sex have any health risks? Like most sexual activities, anal sex carries the risk of passing on sexually transmitted infections (stis). What is anal sex? Anal sex is any type of sexual activity that involves the anal area (bottom). anal sex also has a number of health risks due to various factors including the anus lacking natural lubrication (and so can tear), and the presence. having anal sex can increase the risk of bacterial infection, pregnancy, and sexually transmitted infections, and it can worsen hemorrhoids. Anal cancer risk is more than 3 times higher in hiv-positive men who have sex with men (msm) compared with other hiv-positive men, a cohort study showed. Anal cancer incidence is 78 per 100,000 per year in hiv-positive msms, compared with 5 per 100,000 per year in hiv-negative msms, a meta-analysis has shown. The fraction of cancer attributable to known risk factors in england, wales, scotland, northern ireland, and the uk overall in 2015 kf brown and others british journal of cancer 2018. The epidemiology of anal cancer ae grulich and others sexual health.