My girlfriend and I both have HSV 1, though our symptoms are very rare. I haven't had a cold sore in about 5 years and she gets a sore on her tongue when she's nervous and then rubs her tongue against her teeth. If she doesn't have a sore on her tongue, could I still be infected with HSV 2 if she performs oral on me? If so, what are the chances of this? How can it be avoided?