I've got a better idea. DON'T get her (or him) to liveaboard. Why
screw up a good relationship with too much togetherness? The boat is
your refuge, why give that up?

My wife and I arguing:

Me: "I am tired of this crap, I'm spending the night on my boat"
Her: "OUR boat"
Me: "Wrong, it's mine"
Her: "WE paid for it"
Me: "You know what they say about posession and the law. I do all the
work on her, you dont even know how to raise the sails, she's mine"
Her: "Well then, the house is mine"
Me: "Fine by me, you fix the roof"