I just want to reiterate what CurfewX posted and repeat that HIV does not appear out of thin air. One of you has to first be infected to infect the other.
I'm just curious why you'd assume that HIV could suddenly appear out of nowhere? It's such a strange assumption that I'm truly curious to know how you got the idea. Help me understand why you have this concern?
HIV does not spontaneously generate. If neither partner has HIV, one person cannot give HIV to another person, no matter what.