I believe they’re bonded…I mean, they snuggle, they clean each other, they are always together, but at the same time, it seems they are always challenging each other. Our female is more fearful and our male is very curious and brave. So he’s usually the one who is in charge, but she’ll occasionally challenge him. I caught her draping herself over him the other day and she’ll hump his face and chase him, but then she’ll clean him later on. I added a second litter box again and it helped for a short while, then she started peeing again. I have always spot cleaned their litter boxes daily and then fully clean them every other day, because I thought she was being a diva, but it doesn’t seem to make a difference. She jumps in fine. It’s either he’s guarding the box and not letting her in or she’s maybe peeing on purpose. I’ve kind of just given up if I’m honest. I put down a rubber backed mat and I just remove it every so often and soak it in watered down cleaning vinegar, rinse it and leave it in the sun to dry. It’s working fine, although I would absolutely love for her to stop.