Sister Mary, Sister Sarah and Sister Brenda are walking through the park when they see a young man pissing against a wall. Of course the nuns have to stop and observe this spectacle, as they are all slightly confused."Listen," says Sister Mary, "haven't you always wondered what that, er, thing that men have between their legs is actually made of? I think it's made of flesh.""Nonsense," says Sister Sarah, "it's definitely made of cartilage and muscle!" "Rubbish," says Sister Brenda, it's made of bone!"They are unable to agree, so they go over to the young man at the wall. "Excuse me, young man," says Sister Mary, "could I perhaps, you know, er, touch it?""Why not?" says the young man with a smile.So Sister Mary takes his dick in her hand, gives it a squeeze or two and says, "I told you so. It's just made of soft flesh." Sister Sarah goes over to the young man."Excuse me, young man," she says, "could I perhaps, you know, er, touch it as well?""Why not?" says the young man, his breath quickening.So Sister Sarah takes the dick in her hand, squeezes it, strokes it and says, "You were lying, Mary! Shame on you. It's not soft at all, it's obviously made of cartilage and muscle."Now Sister Brenda goes over to the young man."Excuse me, young man," she says, "I need to, er, touch it too. Is that OK?""Sure!" says the young man, his eyes rolling.So Sister Brenda takes the dick in her hand, squeezes it, strokes it, rubs it and walks back to the other two nuns. "I have proof the thing is made of bone," she says. "Look, I've got all the marrow in my hand ..."