The sailors

Two old sailors were talking after being out at sea for 3 months. One said, "When I get to shore I am going to have a super sauna, hot shower and then find a loose woman". The other said, "Well, good luck to you mate." Later on shore, this old sailor found his loose woman and takes her to his hotel room. Then does what an old sailor would do in those circumstances. After while he says to her, "Well, how am I doing?". She replied, "About 3 knots." "What do mean by that?” the old sailor replied.
She said, " 1. You're not hard, 2. You're not in and 3, You’re not getting your money back."