How long can vaginal fluids survive out of body?
How long can vaginal secretions with HIV survive outside of the body? Have you ever heard of anyone getting HIV from vaginal secretions being rubbed manually on an open sore on the penis?
Sexual transmission of HIV is only known to be occur through vaginal, anal, and oral sex. The possibility of transmission through the activity you describe is theoretical only, and is extremely unlikely given the current understanding of transmission. Survival of HIV outside of the body is only one factor that makes transmission in the scenario you describe unlikely. See "Survival of HIV in the Environment" (http://www.thebody.com/cdc/survival.html) for more information.