I was visiting my sister a bunch of years ago, and was sitting in the living room, minding my own business, when my sister's kid, a five year old named Joey, says in a loud stage whisper, "Mom, what's a condom?"
I can't see what's going on, because this is happening in the other room, but I can hear my sister mumbling to him.
"On your wiener?!" Joey says, loud enough that people in the next state could hear him. "No way!"
Welcome to adulthood.