Know what strikes me, at the very beginning, talking about the honesty of open marriages and on and on(don't feel op views, but the words describing benefits) and great communication. The argument for, nearly implies that the monogamous sect cannot have deep intimacy, trust,communication. I write that, because of the parts about communication.

They aren't for me, open relationships.

Know of a couple, it works for them, good people, just, it's their choice, they seem content as a couple.