I used to believe that oral sex meant the same thing as French kissing. Since sex means putting penis into a vagina, and oral means mouth, it just seemed logical that oral sex would involve swapping spit.
Fortunately, I learned the truth in my early teens. The credit goes to late-night HBO.
A childhood belief about oral sex

others believed things like this
- I used to believe oral sex was french kissing.— Anonymous
- I thought that 'oral sex' was just French kissing.— Rachel
- I believed that oral sex was people having sex in space.
I think I got 'oral' mixed up with 'astral'— PinkPanther - i used to think that oral sex was kissingAnon
- i used to think that oral sex was just a fancy term for kissingAnon
- I used to think that oral sex was talking about sex. I was wrong when I found out the truth.Anon