GMH: Gross Marital Happiness

The country of Bhutan has set its goal for development as "Gross National Happiness" rather than "GNP".  This got me thinking - what would happen if your goal for your marriage was GMH - Gross Marital Happiness?  Bhutan guides its development ideas with "four pillars of Gross National Happiness".  They are sustainable development, environmental protection, cultural preservation, and good governance.  What would be the pillars of GMH?

Would they be "respectful communication" or "acceptance and patience"?  Perhaps "sustainable intimacy"?!  Sustainable romance?

I'm genuinely interested in your thoughts.  What do you think the elements of sustainable happiness might be in a marriage?  Post your comments and let us know!