Reminds me of the first saucy joke I ever heard...
Bloke goes to doctor and says "Doc, I've got a big ball, but I'm embarrassed to show you." The doc says "Look, I'm a professional, there's no need for embarrassment." "But you'll laugh, like all the others." "No, says. the doc, "Just show me." So matey hauls out grapefruit-sized bollock and lumps it on the desk. The doctor takes one look and howls with laughter. "I knew it," says the bloke. "Now I'll definitely not show you my big ball."