So, this old sailor wakes up one morning and decides to put on his old uniform and go down to the docks and have a few drinks for old times sake.

So, he squeezes into the uniforn, heads down to the docks and goes to a couple of bars and tips back a few. At one stop, he's asked by a b-girl if he wants to go upstairs and party.

"Sure thing" he says, and off they go.

After going at it full tilt for about fifteen minutes, he asks the woman " How am I doing honey?"

She replies: " Your'e doing about three knots"!

"Three knots?" he cries. ""What do you mean "three knots""?

"Well", she says, " Your'e not hard, your'e not in and your'e not getting your money back"