Common sense... maybe not so much

I love the classes where you go believing one thing and come out believing something different- it almost feels like you're now looking at the world in a slightly different way. There were a couple things like that for me today. I didn't know until today that divorce usually hurt both parties economically. It almost seems like that goes against common sense. The second (and more surprising) thing I learned today was that better communications skills didn't necessarily correlate with a better marriage. I guess that "good communication" has been stressed my whole life- and besides it just seemed like common sense. My question is if it's not good communication that makes a marriage work then what does?