When i was 9, and just heard about sexual behaviour, I was told, and believed that having sex for one hour gave you one child. Having sex for two hours gave you twins
A childhood belief about reproduction

others believed things like this
- When I was a child I used to believe that cows gave ready butter.— Bane
- When I was a child I used to believe in the little mouse Perez, who gave you money for teeth.
— Chayma - I used to believe that mommies gave birth to girls and daddies gave birth to boys. — Jackie
- When i was little i thought that the mom's gave birth to the daughters and the dad's gave birth to the sons. Anon
- I used to believe that women gave birth to girls and Men gave birth to boys— Rob
- Until I was five, I used to think that women gave birth to baby girls and men gave birth to baby boys— Cassidy K