Scripture does not contain the depths of depravity from paganism. For that we rely on other sources in the realm of "humanities". The admonishment from scripture is "Don't do those things the world does". The scripture referenced by me and quoted by you again highlights the CONTRAST of God's ways versus ungodly ways. We apply what we know and understand from God's inspired writings. In 21st Century Christianity we have lost in translation the view of extreme wickedness of history. My contention regarding TTWCM (this thing we call marriage) is that modern paradigm is so far removed from God's ordained practice that I really don't like the word "marriage". The word itself is polluted with modern connotation and christian worldliness which is kissin cousin to abject ungodliness.
Now regarding our faith and practice, we agree that we need to follow that which has been given. Again the problem might be for some that the exclusiveness of New Testament Christianity ignores the very foundation upon which the apostles wrote. To understand sin we must be a student of the Old Testament underpinnings namely, the Ten Commandments. Our practices and prohibitions should align with those and ONLY then can we call out permissions. It is why I relate directly back to "this is a violation of that" sort of retort. The ancient authors understood the gap between the foundation of Exodus 20 and the vagaries of human nature and so further explanation was given. In the absence of prohibition we have permission. Even still more scripture is given to call out the foolishness in Proverbs et.al. In the face of thou shalt not commit adultery we have "what is the marriage thing that shall not be violated?" There is a God ordained and explained societal structure which the world is constantly trying to subvert namely the patriarchy. Patriarchy insists on delineation of authority. The creation of a contract between two people does not supersede the structure, i.e sexual activity does not trump existing rules. Just because you cleave to each other does not mean you have permission to. In a simplistic way, gardening- read into that mowing, plowing, planting of seed on property that you don't own does not override title of land held by someone else.
Most of us are owners to one degree or another. Imagine if your neighbor took his John Deere to a 60 foot swath of land and plowed under your beets and radishes to plant his tomatoes. You would be quite upset and demand payment for damages. In similar fashion, impregnating my daughter does not mean you get to keep her! Let's negotiate(or not)! Young studly does not make the rules, dear old dad does. Cleaving does not imply nor does a pregnant tummy insist ownership or... marriage.