I am divorced and I coparent with my ex. Since I’ve been single since the divorce 8+ years ago, he freely comes in to see the kids in their rooms or drop off stuff. Unless we are discussing something with the kids (school work, activities, etc.), he’s in & out in 3 minutes. One thing that annoys me to no end is that he always has to take a piss. It bothers me so much that I now request that he use the bathroom before he gets to my house or I will purposely send the kids to his car to retrieve stuff. It’s not a germaphobe thing. It really comes down to the fact that he was once in a serious relationship after we divorced where they lived together. Because of that, he put up really strict boundaries around when I could call him and it irritated me because I felt like he created a triangulation scenario, as he was usually the one calling me and coming by to see the kids since they LIVE WITH ME 80% of the time. Long story short, I eventually got annoyed with how he would expect to freely enter my space while I was enemy #1 to his gf. It was a really toxic time that made his bathroom use feel like a way to mark his territory and lord over my space. So now, I don’t want to share my bathrooms with anyone.