In terms of HIV, oral sex both ways is very safe. The University of California
San Francisco and the
San Francisco Dept. of Public Health just completed a study of men in San Francisco who have only had oral sex and found zero new HIV infections. A very recent study from Spain confirmed earlier studies that oral sex is safe sex in terms of HIV.
Dr. K is Jeffrey D. Klausner, MD, MPH, a board certified internist and infectious disease specialist.