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My little cousin asked me "Where does poo come from?"
I was a little uncomfortable, but gave him an honest explanation.
He looked a little perplexed, and stared at me in stunned silence for a few seconds and asked "And Tigger?"
In my boyhood days, late sixties / early seventies, we watched a British TV children sitcom series, a family with twin boys around twelve. One episode was spun around one of them asking "Mom, what is 'sex'?" The mother attempts to give a decent answer to the question; that makes up the main part of the episode. When she is through, the boy asks "Do I have to write all that?" The mother doesn't understand: "Write where?" "I was filling in this application form for the summer camp, and there is line that says 'Sex'..."