When I was five, my mum told me how babies were made. (Very vaguely). Aside from being utterly disgusted, I thought the mom and dad had to cut their legs off, or bend them all the way backwards to have sex, and the peenee had to be un-erect so you could guide it to the vagina. Until I was 10, I couldn't figure out how the did it.
A childhood belief about sex

others believed things like this
- When I was a little girl, I thought all babies came from 'China' (a Vagina)— Lainie
- I thought "The Hitchhiker's Guide to the Galaxy" was a somewhat casual manual for astronauts.— Katya
- I thought that babies were born out of your bellybutton (couldn't think of anywhere else they pop out of!)— Hattie
- My parents told me that babies were made from dimonds under cabbage patches, that would grow into a baby.Anon
- I used to believe that "euthenasia" was "youth in Asia", and I couldn't figure why that was A Bad Thing.— Kellye
- I thought baby oli was made from pressed babies.Anon