Here is my problem with this whole issue theologically. Biblical Marriage is picture of of how Christ loves the Church. Christ is monogamous to the Church and so the Biblical view of Marriage is Monogamy. In Christ loving the Church he is always faithful, he has eyes only for his Bride (the Church). There is one Church, One Bride. In the same way the Church is called to be wholly faithful to the one who redeems us. There are many passages in the old and new that talk about being unfaithfulness to God. God throughout the Bible condemns Israel for being unfaithful. So if Biblical Marriage is a picture of Christ and the Church the idea that Polyamory does not stand up to Biblical Scrutiny. If you plan to respond with the typical what about Abraham, David, Solomon...etc. You need to understand that the people in the Bible are flawed individuals that do no live up to the the Perfection of Christ. The ideal marriage in Scripture is 1 Man 1 Woman for life.