i used to believe that if you have sex for too long, the penis would stay in your vagina
A childhood belief about sex

others believed things like this
- i used to believe that a penis was the same as a vagina except really long— *stupid*
- i used to think that having sex was licking the persons vagina or penis until u got tiredAnon
- I used to believe if you stayed in water too long your skin would get really wrinkled and stay that way.Anon
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- I used to believe that gay sex involved a man sticking his penis inside another man's penis.Anon
- I used to believe that gay guys had sex by sticking their penis in the other's penis.— Fanbrat