Well, this is kind of a big duh to me. But science has now proven that having a happy marriage lowers stress, as measured by cortisol levels.
http://www.sciencedaily.com/releases/2008/01/080101093852.htm
Remember, oxytocin is the anti-cortisol; it brings the body from arousal to calm. So, a happy marriage equals more cuddling, intimacy and sex, equals more oxytocin, equals faster recovery from stress.
