I used to believe that once a girl "did it" just once, she would get pregnant more than once..as if that little sperm was embedded in her system for life.
A childhood belief about getting pregnant

others believed things like this
- I use to believe that the man peed in the woman to get her pregnant. Didn't know about sperm until sex ed. — das
- a friend of mine thought that you could get pregnant by swallowing sperm. Ha!Anon
- I thought sperm were fish and when I got a goldfish I went around telling everyone i had a sperm— Kara
- A girl could get pregnant going to the bathroom after a boy.— Brandy Gallop
- when i was 7ish i used to think that you got a girl pregnant by peeing in them— nick
- i used to believe a girl will pregnant if kissing a boy on the face— mulan