What Causes Cheesy Vaginal Discharge?

Hi, l was having sex with my girl friend, we were using a condom at first; then we go unprotected. l saw something like pieces of cheese came out. we were scared not knowing what that was. Please, may we have some information abput it. If this is a sort of infection, how could that affect us? Before all that she was complaining of pain and vaginal itching.