The 3 Knots

A very old retired sailor put on his old uniform and went down to the docks once more for old times sake. He found a young prostitute and went up into her room with her. A few minutes later found him goin` at it the best he could for a guy his age and condition. He looked up and asked her, "So, how am I doin` there, Honey`?" The prostitute replied, "Well, old sailor, you`re doing about three knots." "What`s that?" he asked in confusion... "Well, mister, as I said, you`re doing `three knots.` You`re knot hard, you`re knot in...and you`re knot getting your money back!" she calmly explained.