I used to think sterilised humans were referred to as neutered, in the same way as animals.
A childhood belief about reproduction

others believed things like this
- When I was young, I used to wonder what if the animals turned into humans while the humans were away.— Kirk
- sterilised milk came from bulls— kate mullins
- I used to believe when I was a child ,
during xtmas time animals speak like humans after 12 pm— lan - I once had this funny moment as a kid when I accidentally said that my mum was neutered instead of sterilized.Anon
- We had a male cat that wasn't neutered. I thought his testicles were just the cat version of a butt.— Robyn
- I don't know why or where I got this from, but when I was little, I referred to my vagina as my "goose". — StrangeLilGrrl