When I was about 9 I knew that a man's penis had to go into a woman's vagina, however I couldn't work out how it could get in there if it was all floppy!
A childhood belief about rude bits

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 believe that if you have sex for too long, the penis would stay in your vagina— Angela
- i used to think that having sex was licking the persons vagina or penis until u got tiredAnon
- I used to believe that a boy's penis came out of his bellybutton, so you couldn't see it all the time.Anon
- I used to believe that drug stores sold illegal drugs and I couldn't work out how they got away with it.— Bigg Jase
- i though that the man and woman couldn't really have babies until marriage,lmao,what a stupid person i was— what a stupid