Interesting points, thanks. I guess I deliberately stepped away from practical "Christian" concerns to look into what the Bible might actually concern.

Although "sin," for example, is a puzzling and strange concept, I see it as being something like 'death consciousness'. The journey is from animal to human, and 'sin' is thinking as a dying mortal instead of an eternal spirit.

The "patterns of this world" in Romans 12:2 are, chiefly, death and anxiety about death. People want the Bible to regulate sexuality and to give clerics the power to oversee reproductivity. It's fantasy that the Bible sets out to do this. "Cheating" on a spouse would be the same as cheating on taxes.

I do see the divine marriage as the key to the Bible. I see Gen 2:24 as a messianic prophesy. The 'man' who leaves Father & Mother is not Adam, who has neither father or mother and doesn't leave them. This 'man' is the messiah leaving Heaven for Earth. “I came from the Father and entered the world,” Jesus says in John 16:28. The word exēlthon, or ‘come out’, means to get out or ' leave' (cf. Mark 1:35, “left the house”).

Reference after reference becomes to this narrative and not human sexuality. The 'marriage bed' that shouldn't be defiled is clearly a temple reference. A temple is a "bed." How else is a marriage bed "defiled," exactly? In OT law, sex with slaves, prostitutes, concubines, etc etc. is all legal. If you wanted to defile a human marriage bed, in OT law, I guess you could have a man sit on it when his wife is menstruating

The Christian imagination of God policing the "marriage bed" as if that enforces monogamy is typically goofy.

I deal with that verse here with an assist from Margaret Barker-

https://medium.com/belover/christians-made-up-their-stupid-sex-rules-1596845602b7