I used to believe that once you became an adult, your nipples were always erect. for a long time there, i thought mine were broken...
A childhood belief about rude bits

others believed things like this
- When I was little I thought that only little girls had nipples, and they went away when you grow up. — Cutie
- I thought nipples disappeared at a certain age because Barbie never had them.Anon
- When I was younger, I thought sex was two peolpe pressing their nipples together.— Katz
- I used to believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- When I was younger I thought I had made up the word "nipples" and "thinga-majigger" — Amelia
- My parents told me I was found under a gooseberry bush which I thought odd for a long long time.— Kate