I used to believe that girls pee through their, well, anuses, because they always sit or crouch when they pee and poo, so i thought it's kinda the same.
A childhood belief about weeing and pooing

others believed things like this
- I used to think that girls' anuses were green. I remember thinking that as late as high school.— Jack
- I thought that the difference between girls and boys was that girls have teeth.
Anon - I always thought when I was a kid that Milo is for boys and that milk are for girls. . . — Cathyia
- When I was a kid I thought girls peed out of there vaginas...woops!— Greg
- i thought cats were girls and dogs were boys. Anon
- when i was very little, i thought that all girls must do ballets, and that i was lucky who wasn`t forced to. — little miss from norway