I use to believe that you got pregnant by kissing too intensely.
This came from Look's Who Talking and seeing them kissing and then showing the sperm. Movies should be more explicit.
A childhood belief about getting pregnant

you weren't the only one
192 of you believed this
- i used to believe that if u kissed a boy u would get pregnant.i was scared when i had my first kiss.— imbrressed
- I used to believe that french kissing could get a girl pregnant.Anon
- When I was in 6th grade I kissed a boy and thought that I would get pregnant.Anon
- When I was little, I believed that a girl could get pregnant by loving her husband and kissing him.— Ryne
- that if u ever kissed a boy you would have a baby— maha
- I used to believe that when my parents kissed it made a baby.Anon