And therein lies the issue. If your relationship revolves around having other people, how is that healthy for the two in the relationship? And how does one start down this path? What is the source? Why does one or both parties develop a need to have others involved, and those others feel the need to have other people involved and so and so forth? That is what I am getting at.
The big picture comes from some "artist's" hands---from small to large.
That is not for you or me to say. It doesn't matter if the source of their happiness and healthiness is from other people. What is deemed happy and healthy is largely subjective. If two couples agree to the swinging lifestyle, and its what makes them happy and healthy, its not for me to ask, "Why does your relationship have to revolve around other people?" I don't care. There is no written rule that happiness cant be derived from people outside ones marriage. Thus, it is not an "issue" if it doesn't negatively impact their lives.
As for the couple in the article, perhaps they both derive their happiness from outside their marriage. So, be it. My problem is just the way they are going about doing it. It doesn't seem as cooperative as they are leading people to believe.