Men put a lot of effort into the relationship in the begining, then cross off "wooing" like it's just anothe item on a check list after the wedding. "What's the point? I already got her." KEEPING her is the trick.
I think that this is why the burden of maintaining a relationship falls on the female the majority of the time. We're designed to maintain our goals. (house work, 20 years to raise a child, hair, nails, make up, etc.) Men feel that a job is done after they accomplish their goals, then they put it behind them. "Catch a wife... wife caught... done. Me want sex. Woman doesn't give sex. Woman cold fish. Me hate woman. Woman change after wedding and no want sex. Marriage bad."
Well, duh.