Answer:
Salty water everywhere but not sea in sight.
All about the house, with his lady he dances, yet he always works, and never romances.
I am a good state, there can be no doubt of itΝΎ But those who are in, entirely are out of it.
I can be written, I can be spoken, I can be exposed, I can be broken.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
It rows quickly with four oars but never comes out from under his own roof. What is it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?