When I was little I heard someone talking about having a vasectomy and my mom explained that it was so a man couldn't father children any more. She didn't explain how it's done, so I thouht it meant that they cut the guy's penis off.
A childhood belief about rude bits

others believed things like this
- I used to believe that a boy's penis came out of his bellybutton, so you couldn't see it all the time.Anon
- I believed that oral contraception meant talking your way out of it x]— Stupid
- I used to believe that "Our Father, who art in heaven" meant that God was also a painter on the side. — Amanda
- When I was in sixth grade I thought that "oral" sex meant talking about sex.— Duh
- I literally thought “oral sex” meant talking about sex until 8th grade health class.— Kai
- I used to think that boys didn't get their penis until they were 18 which was legal adulthood! — beckles