Super risky but I was so curious to see what it was like. There was a small girls bathroom in a back hallway in my high school that I could quickly check to see if anyone was inside by popping open the door and looking under the stall dividers. I could hear if anyone was coming down the hallway so I would go into a stall and wait. I was fascinated by the used tampon and pad receptacle, the smell of girl pee if someone didn’t flush, and there were some old screw holes in the dividers that I could peek through. I saw some amazing things! I did this a few times, continuing into college until I almost got caught. At that point I stopped. Nowadays with all the spy camera footage I can get my thrills without the risk, but nothing beats actually being in the girls bathroom sitting on the toilet where so many bare asses have sat.