i have a few questions about possible hiv transmission via contact with precum. if a man rubs his precum on the head of my penis, am i at risk? if he is touching himself and potentially gets his own precum on his finger and then puts his finger in my anus, am i at risk? if i perform oral sex on him briefly, potentially getting precum in my mouth, and i have some very small abrasions on the inside of my mouth, am i at risk? i just want to get a sense of how possible hiv transmission is in these situation so i can make the best possible choices.