My partner and I have a lot of sex and have been without a condom for a few months. It has never been painful for me and always enjoyable. Recently with the last few weeks near the end of the first round it starts to burn and be really uncomfortable. After sex when I go to pee it also hurts a tiny bit. My inner labia is red after and hurts to touch. I've been tested before we started dating so I didn't have anything before him. What else could it be? It is usually just during sex.