The Marriage Myth: Why do so many couples divorce? Maybe they just don't know how to be married.
Gottman found that all couples -- those who are happily married into their rocking-chair years and those who divorce before they hit their fifth anniversary -- disagree more or less the same amount. He found that they all argue about the same subjects -- money, kids, time and sex chief among them -- and that for the average couple, 69 percent of those disagreements will be irreconcilable.
read it all here washingtonpost.com
really good stuff