We had something similar to the two doors one room thing at a camp I was at once for a school trip. So, there were four rooms in the lodge, the upper rooms were usually for girls, the lower ones usually for guys. Now, the rooms were on the edge of the building, with the bathrooms next to them on the inside, and the staircase between those. The bunks led to the nearest bathroom, ours said boys, since we were on the bottom floor. Here's the thing: on the main door into them, it said girls bathroom. You can imagine how well that went, I guess the teachers didn't know about it, and the staff didn't bother mentioning it.
tania, I don't know about you, but I look so I don't just randomly drop the toilet paper.