Impossible, no. It happens. The presence of HSV-1 however reduces the risk. EWH
so basically it's almost impossible to get oral hsv2 ontop of hsv1
You are correct on both counts. Whiel there are no sure things, the odds are certainly in your favor. EWH
she has been tested negative. it definitely does help but i thought, after reading, that getting in the mouth is rare to begin with and secondarily the fact that she already has oral hsv-1 would really help reduce the odds she gets it there? is that true?
Welcome to the Forum. In answer to your questions:
You cannot get HSV or any sort from your GF. As you point out, the immune response to the infections you know you have keep you from being vulnerable.
As for your GF, her HSV-1 means that she cannot get more HSV-1 from you, anywhere. On the other hand, while her HSV-1 makes her a bit less susceptible to HSV-2, she can still get it. She can acquire at any site of exposure to your site of infection, whether or not you have an outbreak although transmission is more likely if lesions are present because more virus is present when lesions are present. (I'm presuming she has had a type-specific blood test and is sure that she does not have HSV-2).
I think this addresses your question. If not, please ask again. EWH