I'm going to qualify this and say that it works for some people - but probably not a vast number. The rate of divorce is 50% and a lot of people stay together in unhappy, sexless unions. As you've pointed out, the answer is not necessarily some form of non-monogamy but instead a more intentional co-creation of a relationship that works for you both rather than mindlessly relying on the old structures of marriage designed by patriarchy thousands of years ago.

My husband and I thought we had a really good, progressive monogamous relationship. It was only when we decided to open up that we saw just how many assumptions we were making and how many aspects of what relationships "should" be that we had unconsciously bought into. Challenging those and really having a marriage that works for us because we're conscious of it and have chosen it is the best thing that has ever happened to us.

Really important piece!