I used to believe that when a man got an erection it would stick straight out about a foot long and be as hard as metal. So I was always extremely confused when guys in movies with erections had a lump in their pants. I logically assumed that an actual erection was only shown in NC-17 movies and that these were just how hard-ons were represented in movies XD
A childhood belief about rude bits

others believed things like this
- I used to think actors in movies sometimes had to actually die to make the movies look real.— Dero
- I used to believe that "sue" meant murder, so in movies when someone is getting sued I got really confused— I don't know
- I used to believe whenever I got an erection it meant I had to pee.— Adam
- I used to believe that a homosexual is a man who doesn't have erection. — paatrik
- I used to believe that an erection was called a 'wallet'.Anon
- i used believe and erection was when your testicles went into your penisAnon