I used to believe that each mans penis had a different shape. I was really hoping the man I would marry didn't have a triangular one.
A childhood belief about rude bits

others believed things like this
- I used to believe that farts were triangular with the ends rounded so they wounded hurt.Anon
- i used to believe that condoms stopped a mans wee getting out while having sex.— a boy
- I used to think that boys didn't get their penis until they were 18 which was legal adulthood! — beckles
- 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
- I used to believe that gay guys had sex by sticking their penis in the other's penis.— Fanbrat