The one time when she and I first got together and she spent the night, I made it very clear I wanted her to leave in the morning. She was uncomfortable and brought it up later because of my behavior.
I’ll never tell her it’s because since I only had one bathroom at the apartment, and she was on the toilet that morning forever, and I had to do my number 2 in a small trash can on the back patio area I had. After she left I tossed my clothes and the trash can in the dumpster and took a long shower.