An old man goes up to a prostitute. He says, "How much do you charge?"
She says, "$300."
He replies "I've got no money, and all I have are these two Olympic gold medals I won in the 60's."
She says "That'll do," takes the medals and off they go to take care of business.
Next evening another old man approaches, "How much do you charge?" he asks.
She says, "$600."
"Are you any good?" he then asks.
"Well, I've two Olympic gold medals!"