Okay so I shave using a razor. You can change the blade at the end of the razor. I keep multiple blades because over time the blade can get dull. One of these blades I use to trim my pubes.
My Dad walked into my room today and said, "hey son, I took the last blade on that row of razor blades for my razor, to shave. I hope you don't mind."
That's the blade I use to cut my pubes! I didn't tell him, it's too funny.
Should I break the news to him after a few days or swap it for another blade when he isn't around?