But...
Meatball - "Hey dad. Why does the dog lick his penis?"
Me - "To clean himself."
Meatball - "But he licks my face."
Me - "But you let him lick your face. So..."
Meatball - "That's rude."
Me - "He's a dog."
Meatball - "So what? Would you lick someone's face after you licked your penis?"
Me - "No."
Check please.