However, the presence of high amounts of virus in the blood (especially very early or very late in the infection) or other genital ulcers makes transmission more likely. Anal intercourse is also associated with much higher rates of infection. Without penetration, HIV transmission is unlikely but not impossible.
Using a latex condom dramatically reduces risk of transmission of HIV and other STIs.
Dr. Roach regrets that he is unable to answer individual letters, but will incorporate them in the column whenever possible. Readers may email questions to ToYourGoodHealth@med.cornell.edu.