I used to think that since gay men were the functional equivalents of women, they would go out with straight men. Same with lesbians and straight women.
I also used to think that "eating pussy" actually involved consuming the flesh of the woman's nether regions, and I was never too clear on whether it would grow back or not.
A childhood belief about sex

others believed things like this
- I used to think making straight A's in school was literally writing A's straight. Anon
- Women were impregnated by eating a lot of cheese— George
- I used to believe women became pregnant by eating pimento olives.Anon
- i used believe that if someone had sex they would have a baby straight away— me
- I used to think that if I told even one little whhite lie, I would go straight to hell.— Debbie
- if you eat toothpaste straight from the tube, you will get worms— wormelow