Bacterial infection nightmare

Every time I have sex with my kids father I run the risk of catching BV, Bacterial vaginosis. It was only after my two c-sections that it started happening. Oddly enough only when he nuts inside me does it happen to me and the doctor says its not him thats the problem. She says it has nothing to do with him. Its so frustrating having this issue because i hate having that fishy smell down there. Ive been with him for 4 years and hes comfortable with it when it does happen but i am not.

You guys got advice on this. Any natuarl ways to keep my PH balance together and keep this peoblem at bay FOREVER.