Up until 5th grade (when we watched the sex ed video), I thought that when girls reach the age for having children, they spontaneously develop an opening between their anus and their vagina where intercourse takes place. I also thought when a girl said she was having her "period" that was another term for saying she was having sex.
A childhood belief about reproduction

others believed things like this
- In my second grade class everyone thought that sexual intercourse was "TALKING DIRRTY".— Israel Bliss
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg
- In 6th grade, I thought that once you got your period, you'd have it forever!!!! 24/7Anon
- When I was a little girl, I thought all babies came from 'China' (a Vagina)— Lainie
- When I was first told about intercourse, I didn't believe it. How could peeing inside a girl make a baby?— Art
- When I first started to develop my breasts I thought it meant I was producing milk— trisha