Don't forget the "Honey do" lists. After the honeymoon's over, there's a series of quests you have to complete in order to get "Lovers Comfort", lol.
Oh, I assure you those quests are there. Aela's forever sending me to clear a beast, typically made of "shterner shtuff," as she says, out of somebody's house or some random cave. Okay, I understand having a wolf, bear, sabrecat, ice wraith, troll or skeever in the house is a problem, but a cave somewhere? And why is it that the homeowner locks the door half the time?
As for the divorce option, etc, yeah, I can see it now. I'll step outside and a guard will run up and say, "In the name of the Jarl, halt! You are late on your child support payments."