This was more than a gender and anatomical distinction. God was already planning for a marital union that no other creature would know…with Himself at the center. It would be a holy relationship.
Yes, God also made it clear — that His plan involved a love relationship. This plan was inferred when He took note: “It is not good for man to be alone. I will make a helper suitable to him.” (2:18)
It was God who intentionally formed the first marriage between Adam and Eve (vss.20a-24). They would indeed become “one flesh” (vs.24b).
God fashioned marriage to fulfill His plan. This was not an arbitrary, time-limited experiment. This was a timeless strategy bathed in love. Mankind would experience the deepest form of human love in this relationship. This included physical intimacy for the sake of procreation and pleasure.
What God placed under the distinction of “very good” (Genesis 1:31a), Satan saw as a arena for corruption. Indeed, we find sexual immorality as a significant sin throughout the Old and New Testaments. What is sacrificed is the good and Godly quality of this action as an expression of love.
Centuries later, the apostle Paul would offer this qualification for marriage and intimacy: “…since there is so much immorality, each man should have his own wife, and each woman her own husband. The husband should fulfill his marital duty to his wife, and likewise the wife to her husband. The wife’s body does not belong to her alone but also to her husband. In the same way, the husband’s body does not belong to him alone but also to his wife.” (1 Corinthians 7:2-4)
God’s alternative is marriage…as it has been from the beginning. He fashioned it for goodness. He has never changed His position on this “love institution” He formed. We certainly have no human right to alter it. God can not bless what He does not endorse.