An old retired sailor put on his old uniform and goes down the docks once more for old times sake
He hires a prostitute and takes her up to a room and hes going at it as best he could for a guy his age
The old sailor asks,’ How am i doing?’
The prostitute replies,‘Your doing about three knots.’
He replies,‘What’s that supposed to mean?’
She says,‘Your knot hard,your knot in,and your knot getting your money back.’