Shortly before junior high, I had gathered that a "blow job" involved penis-sucking, but I also believed that it was actually a JOB, and that people did this for a living (turns out I was right, but not in the way I thought!). I even went so far as to tell other students that one of our teahcers "had a blow job at night"...man did I get some weird looks...
A childhood belief about oral sex

others believed things like this
- I used to think that if you didn't blow your nose and just sniffed the snot up, you head would blow up.Anon
- I used to think blow jobs were when you held a penis and blew on it. Of course this was when I was 12.— Marisa
- i used to believe that a blow job was when you got payed to blow up ballowns— blown away
- I used to believe that when people got shot in the head that their heads would blow up. — Emily
- I once believed that a blow job was when you sprayed paint onto a car to cover up scratches.
— Roman - i believed that if you farted too much in a room and you were to light a flame your house would blow up— the nuclear fart