Analingus (also known as rimming) is risky for transmission of sexually transmitted diseases andbecause of the presence of stoolfor gastrointestinal illnesses as well.
While infections on the skin such as herpes and syphilis can pass between partners during analingus, the person performing oral sex is also vulnerable to parasites, hepatitis A, and other gastrointestinal illnesses, reports Jeanne Marrazzo, MD, an infectious disease specialist at the University of Washington in Seattle.
How to reduce risk
Using barrier methods such as dental dams, plastic wrap, or cut condoms can greatly reduce the risk of infections. "One should also consider a hepatitis A vaccination to prevent infection," says Dr. Marrazzo.
Also ensure that your mouth is in good health. Avoid oral sex of any kind if you have cuts, bleeding gums, or open sores in or around the mouth, which can greatly increase your risk of catching a sexually transmitted disease.