He is bad for my pH

I dont know if this has happened to anyone else but every time, literally, we have sex my punani seems to be upset. I smell this weird scent afterwards for days. I know its him because hes been gone for a month and I smell fine. Before we've even tried him not cumming inside but it the scent still occurs. I've gone to the doctor and they said I'm fine. Maybe advice on what he could do?