Hi-
Me and my girlfriend had an unprotected threesome on june 5th. About 6 days later, with no pain or discomfort, i noticed a sore around the foreskin of my penis. we went to the clinic and got tested 6 weeks after having unprotected sex. The results came back negative for everything. since then, after sex sometimes i get a scratch near where the sore was, there has never been a blister. i showed the Dr. and he said it was irritation. Another Dr. said it could be a yeast infection which my girlfriend gets quite often. i have not been treated for the yeast infection. my question is can yeast infections cause sores and also is 6 weeks enough time? we both got tested and we have completely different immunity responses to illnesses like colds and flus,i.e. she has had a sinus infection for 3 months, i would hav itfor a week. i would think that if one of us had a serious std we would hav found out. Any advice?