I was once told, and believe this almost fully, that you would get lock-jaw from giving a guy a blow job if you did it for a too long. This was told to me 7 years ago.
A childhood belief about oral sex

others believed things like this
- We told our little sister that she had a long bushy tail and she fully believed us for ages!!Anon
- i used to thynk you could get pregnant by giving a blow job. i thought that waz the only type of sex.Anon
- I was told as a kid that if you kept stuffing a Big Buddies (bubble gum)I would get lock jaw.— Dawn
- I used to believe that if you had to fart and held it in too long that it would cause you to blow upAnon
- I fully believed, up until about 6 years old, that the word 'accident' was a noun that meant 'burnt toast'.— Karl Goetz
- I was told in first grade that if you fart burp and sneeze at the same time you would blow up— bob doodle