What contributes to a happy marriage?

What contributes to a happy marriage?

Based on your knowledge of psychology and reading of the following online article having to do with marriage and happiness, write a brief two to three paragraph essay that answers the question: What contributes to a happy marriage? What physical, mental, emotional, and social factors may contribute to a happy marriage?
Go to the following link:
http://www.livescience.com/7015-altruistic-love-related-happier-marriages.html
Preferred language style Simple (Easy vocabulary, simple grammar constructions)