sxc666: Balance is the key V, if this is not achieved arguments will begin and resentment sets in.
And that's where 'communication' comes in. If 2 people keep the channels of communication always open, there shouldn't be any resentment that develops. And this brings me to the issue of respect. Respect for the other person, the load they have.
I have a colleague whose wife quit work to stay home and have a family. Yet I would shudder when I found out that she still expected him to be the one to get up in the middle of the night if the baby, and later, toddler, needed attending in the night, or had to rush home after a professional meeting ending late evening, to do various chores, look after the child, anything. Sure some respite she would need, but this was beyond that. It was a regular mandatory requirement. One that if not met, she would threaten divorce!