I (28m) and my girlfriend (27f) have been dating two years. Everything is great but when I go down on her, she has an odor downstairs. I’ve had multiple relationships and have never had this issue before. I have a feeling she may have a PH imbalance, but I don’t know how to tell her without making her upset. I don’t want to cause problems with her, but at the same time it’s causing a problem in our sex life.