Two things you need to know.
1. My Grammy refuses to use the word “penis”. She won’t spell it, say it, or even acknowledge it’s existence.
2. I was not present when the following conversation took place, and it’s a good thing, because I might have laughed myself to death. To death.
Sister Contrary: Grammy, why won’t you say penis? It’s a medical term. Doctors use it!
Grammy: I just won’t.
Sister Contrary: You won’t say penis, but you have no problem saying tallywhacker?
Grammy: Oh! Tallywhacker just sounds like more fun!
You can’t argue with her reasoning.