When I was a child I went to a boarding school for the blind. We guys were trying to figure out where babies came from (with no knowledge of the female anatomy). We concluded that the husband put the sperm in his wife's anus and the baby came out her naval.
Boy was I surprised when I got older.
A childhood belief about reproduction

others believed things like this
- When my wife was a kid, she used to think that highway speed bumps were for the blind.Anon
- When I was three I used to believe that cow and horse are wife and husband.— xenia
- I used to believe that boarding school was where people went to play board games.Anon
- When I first met my husband, he thought women didn't fart. He was really surprised after he met me!!!Anon
- When I was little I thought that a honeymoon was when the Husband and wife went to the moon and eat honey.— AmAnDa
- I used to believe the little bumps on a womens nipples spelled out "suck here" in braille for blind babies— Bubz