From Simplemarriage.net:
To put this discussion into perspective, let’s review the characteristics of strong, stable, and satisfying marriages. While it is understood that there is not one way to have a stable and satisfying marriage, there are some common factors worth highlighting. Research states these characteristics as: investment in the well-being of the beloved; respect; admiration; sexual desire; intimacy; commitment; exclusivity; and understanding.
Oh, man...I'm hosed.