When I was around 4 or 5 I knew what two parts you used to have sex. And I also knew that pee came out of those two parts. So there for I thought that if two people would pee into the toilet that would make a baby. I was always so nervous when someone forgot to flush!!
A childhood belief about sex

others believed things like this
- When I was little I thought girls had "man parts" as well, but it just took longer for them to grow.— person
I used to believe a man and a woman needed a doctor to put their parts together when they did it.— Phil- When I was little I believed that boogers were parts of my brain that got used up.Anon
- i used to believe that boggies are parts of fluff that fly in to your nose— natasha hawthorne
- When I was a child, I used to believe that armpits were private parts— Duda Gueiros
- I used to believe lepers came from Ireland. Like leprechauns, only with less body parts.Anon