In the next video for YourTango, John Gray, LiYana Silver, Debi Berndt and I continue our discussion with what makes monogamy work. 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.