Are we biologically equipped to spend our lives with one person? Is monogamy even realistic? 

Our changing culture and values (not to mention longer lifespans!) are making a committed relationship seem harder than ever, but that doesn't mean you can't have a happy, faithful and fulfilling marriage. Relationship experts John Gray, LiYana Silver, Debi Berndt and Tammy Nelson dished with YourTango Experts Senior VP Melanie Gorman about what makes couples really go the distance. You may even find that your committed relationship is better than it was when you were casually dating!

Check out the video above to learn how to nurture your monogamous relationship, and why it's so important.

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