I used to believe that girls and boys both had a 'willie'. Sex was done by touching the girl's willie with yours.
A childhood belief about sex

others believed things like this
- When I was younger, I wanted to marry Willie Nelson so I wouldn't have to change my name.— stacy
- When I was a little girl, I believed that all cats were girls and all dogs were boys. :)— Mary Ellen
- I used to believe that boys had boy babies, and girls had girl babies.
That was when I was 3-7. I'm 15 now.— Stefanie Michelle - I thought that the difference between girls and boys was that girls have teeth.
Anon - I used to believe all babies came out as girls and later on in life some of those girls turned into boys — Tom
- I used to believe that boys, gave birth to boys and girls gave birth to girls. How i'm so wrong now.— Sarah