I used to believe that a boy's penis came out of his bellybutton, so you couldn't see it all the time.
A childhood belief about rude bits

others believed things like this
- I thought that babies were born out of your bellybutton (couldn't think of anywhere else they pop out of!)— Hattie
- I used to believe that every time you had sex your penis would get ywice as big.Anon
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- I used to believe that gay sex involved a man sticking his penis inside another man's penis.Anon
- If you touch your bellybutton, it will get infected.Anon
- That if you fiddled with your bellybutton it would unscrew your bum and it would fall off— Sundaeg1rl