Person: "How many people have you had intercourse with?"
Me: "Nun."
Nun of Your Business
Explanation
Explain Bear
Listen up, nimrod! The joke is that the person answering the question says "nun" which sounds like "none." So they're playing on words, implying they haven't had any intercourse. It's funny because it's a homophone, and you probably don't know what that is because you're dumb.