From a psychotherapy perspective, this ‘marriage’ is doomed to fail based on the systemic theory of triangulation -
“Someone is always uncomfortable in a triangle and pushing for change. The insiders solidify their bond by choosing each other in preference to the less desirable outsider. Someone choosing another person over oneself arouses particularly intense feelings of rejection. “
Tags: [polygomy, triangulation, family therapy, marriage therapy, marital therapy, AAMFT, counseling, psychotherapy, marriage, civil union]

The slippery slope strikes again. The “Oh that will never happen” folks have been proven wrong.