I would think that in most cases a guy would get tired of putting up with her sh!t way before he would get tired of F'in her.
Think about it, even a bad lay is still pretty good, but a womans baggage can truely suck:
You need to start hanging out with My friends.
We need to go to my____________'s wedding, birthday, anniversary, recital, etc.
Where is this relationship going?
Are you going to spend all day playing that game?
We never do anything anymore.
Not tonight honey.
You want to put it where????ewwwww no!
Why aren't we like that couple?
Isn't the boat, gun, game system, car, bike, etc. that you already have good enough?
Sadly the list could go on.
Clearly a man could get tired of this waaaaaaay before he could get tired of the other thing.