Felix and Oscar, two old retired sailor, put on their old uniform and head for the docks once more, for old times sake and some hot sex.
They engage a lovely prostitute and take her up to a room.
As Oscar watches, Felix is soon going at it as well as he can for a guy his age, but needing some reassurance, he asks, ‘How am I doing?’
The prostitute replies, ‘Well Felix, ya old sailor, you’re doing about three knots.’
‘Three knots?’ he asks. ’ What’s that supposed to mean?’
She says, ‘You’re knot hard, you’re knot in, and you’re knot getting your money back.’