My boyfriend used to believe that girls peed out of their butts. Actually, he believed that until he was ~19 years old. I'm not sure he mentioned that in our conversation, but I set him straight (after much ridicule--19 years old!)
A childhood belief about weeing and pooing

others believed things like this
- When my brother was little, he believed that girls peed out of their boobs.— Emily
- I used to think girls peed from their butt.— Neil
- I used to beileve girls peed out their butt 😂Anon
- When I was a kid I thought girls peed out of there vaginas...woops!— Greg
- For years and years I believed that tuna must be really little fish because they came in such small cans!!— Gisela
- In first grade a boy told me that he could see girls naked with his microscope lens. I beleived it for years.— Jeanette