I don't believe that there is one right type of marriage. Rather, I think it is best for the couple to choose consciously, thinking and feeling things through.
My wife chose the meaning "until death do us part," phrased as "until we enter the will of God," and we've been married 26 years, and are growing stronger together. We help friends and family, including caring for aging and dying parents.
Looking back, though, I might have chosen differently. For many years, conflict with my wife prevented me from doing my spiritual practices. I recommend couples answer these questions:
- What do you need so that you can live true to yourself, with or without a partner? Will your partner support you living true? Would you leave if he or she didn't?
- What is the purpose of marriage? What makes it more than a convenience? What is the value of staying through illness and poverty? Of knowing the other will stay through with you?
- What are your limits. Would you leave in case of adultery? In case of spouse or child abuse? In case of criminal conviction?
I believe that all marriage (including same-sex marriage and group marriage) is sacred, and can be kept sacred through the conscious choice of all parties.