Religious Survey Response
I live as a practicing Christian Scientist. Without going into a lengthy dissertation on religious philosophy, it is impossible to define what that means in a reasonable number of words to those unfamiliar with the concept. For the purpose of only answering the question in this forum - to me human love must reflect the characteristics of God's Love. God's Love, being infinite in nature, so must human love reflect those unlimited characteristics. Some within my faith will find my logic flawed and insist along with traditionalists that somewhere marriage is defined by God, but I insist that marriage itself is but a human concept explained and defined by possibly spiritually inspired, but also flawed humans. In the human realm, there is the real and perfect man that we sometimes recognize as God's creation, and there is the "old man" which we constantly strive to put off. This "old man" (false man) is the source of flawed thinking. As long as we are still in the human realm, there will appear well meaning but flawed thinking, along with real and right thinking, side by side. As humans, we must sort the wrong from the right if we would be happy and successful.
To me it has all recently opened up and become clear. I tend to agree with those who cannot find any specific scriptural insistence on monogamy, and I believe it is not there because of the reflective quality of man (woman) to God defined above. Man (woman) exists because we are His (God's) expression. That is simply what we are (spiritually and absolutely) by nature, whether we know or admit it or not. That expression is the complete manifestation of Love, and therefore contains no limited characteristics. We all have enough love for everyone. Love is not a finite measurable or limited thing.
I could say a lot more, but it would be misunderstood, like possibly what I already have written may be.