 [ Symptoms ] can african american people get lice [ Disease ] yeast infections can just happen whether the person is having sex or not i guess that is is possible for sexual activity to be contributory but it is not necessary there is really no way for me to know if your girlfriend has yeast or something else without an examination so if there is a concern she will need to see her medical provider in the meantime she can treat a simple vaginal yeast infection using monistat vaginal cream or an equivalent product   available over the counter