Have you ever heard of Jane Doe? Well, her husband's name is Dill, so I guess that makes him a dildo!
Jane Doe's Husband
Explanation
Explain Bear
Listen up, buttercup! The joke is that the woman's last name is "Doe," and her husband's name is "Dill." Put 'em together and you get "dildo." Get it? No? I knew you were dumb.