I don't sneak. It's more like at my school, the girls hang out in the boy's change-room/toilet (it's Australia. We don't have locker rooms ^^) and the guys hang out in the girl's...
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Yeah, I've snuck into the boys locker room a few times. My best friend dared me to, so I did, but unfortunately (or maybe fortunately?) the high school swim team was in there changing so I was like, "Oh, um, sorry, sorry! I walked in here by mistake." and then I walked out to a bunch of whistles and half-clothed boys.
I've been in the boys locker room before but I didn't have to sneak it was both in jr high and in high school. In jr high it was after basketball practice and I had to go with my coach to talk to the male coach no one was naked or anything and it was just like the girls locker rooms.
In high school we had a basketball tournament held at our school and we let the visiting teams use the girls locker rooms and we used the boys. It was pretty much the same except for the toilets. But no one informed me until later so I had an awkward moment when I started to change and a boys basketball team walked in o.o
I haven't snuck into there but I did have to open the door to the middle school boys' locker room along with my friend because the teacher was too lazy to do it and ew it smelled gross (the bathroom connected to the locker room).