When I was a kid my mom explained sex to me but only the reproductive part. I didn't know anything about erections so I though people had sex by scissoring.
A childhood belief about sex

others believed things like this
- I used to believe that the babys born in the back part of your body and not in the reproductive system.Anon
- When I was a little kid, I believed that erections were caused by the need to urinate.Anon
- when I was little my uncle told me he was part bear. I believed people could be part bear until I was twelve. — Audrey
- I didn't understand about boiled eggs until my Mum explained I wasn't supposed to eat the shell as well.— Chris
- I used to believe that when I went to movies people were behind the screen acting out the part — Amy
- I used to believe that when people broke bones, doctors would give them a new part of the body they broke. — Kelly