I used to think that in order to have sex, you had to pee or poop in a cup at the same time as another person, trade the cups, and then quickly consume the contents. This was only after I was told that kissing isn't sex (I was 4 and thought I was pregnant because a little boy forced a kiss on me), and I was taking a stab in the dark as to what sex actually was. I even took a Tupperware container to the bathroom once to see if I was "any good" at sex, which of course was decided based on how well you can pee in a cup.
A childhood belief about sex

others believed things like this
- I used to think that in order to have a baby two people needed to kiss for 15 minutes with taking a breath. Anon
- Up until I was 9, I thought that you could get pregnant from kissing. — Cel
- I used to believe that women got pregnant just by kissing. — Lisa
- i used to believe that women got pregnant from kissing.— tripod tod
- I used to believe that a women gets pregnant my kissing a man. — Shea
- i used to believe that if u kissed a boy u would get pregnant.i was scared when i had my first kiss.— imbrressed