The Old Sailor

A very old retired sailor puts on his old uniform and goes down to the docks once more for old time's sake. He finds a young prostitute and goes up into the room with her, draping his sailor suit across the bed. He's going at it as best he can for a guy his age. He mounts the young gal and is pumping away.

He asks, "How am I doin'?"

The prostitute says, "Well, sailor, you're doing about three knots."

"What's that?" he asks.

She says,"You're knot hard, you're knot in ... and you're knot getting your money back."