A road-wary old biker walks into a saloon to have a cold beer after a long, dusty ride. At the end of the bar, he sees a rather good-looking "lady of the evening". She smiles at him and asks if he's looking for a good time. Well, having been some time since his last snarlin' he accepts. After agreeing on a price, she escorts him up to her room and they start humpin'. After about 10 minutes of furious banging the old biker asks:
"So babe, how am I doin'?"
She replies:
"You're doin' 3 "knots".
"3 knots?.... What's that mean?" replies the biker.
She said:
"You're NOT hard, you're NOT in and you're NOT getting your money back!"