only theory risk ,
Transmission from an HIV positive active partner to an HIV negative receptive partner is generally believed to be less common.This is because HIV is normally only present in saliva in very low levels that are not sufficient to cause infection.The only risk in this scenario would be from bleeding wounds or gums in the HIV positive person's mouth or on their lips, which may transfer blood onto the mucous membranes of the other person's genitals or anus, or into any cuts or sores they may have.