When I was very little, I used to believe that at some point around adulthood, everyone swapped from male to female or vice versa.
A childhood belief about sex

others believed things like this
- I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil
- when i was little thought that ants changed traffic lights from green to red and vice versa.Anon
- I used to think that when you had sex the male was sucking the life out of the female!— dude
- I used to believe all cats were female and all dogs were male.— Sabby
- I used to think that all cats were female and all dogs were male. — Annalisa
- i used to believe that all cats were female and dogs were male!Anon