“one flesh.” The phrase “one flesh” has many implications and a very deep meaning. The most obvious way a man and woman become “one flesh” is in the act of sexual intercourse, as we learn from 1 Corinthians 6:16. However, God never intended the act of sexual intercourse to fulfill what He meant by “one flesh,” even though sex is one way the two become one.
God’s desire in a one flesh relationship is that the couple become unified in many ways, physically, emotionally, and spiritually. The two, together with God Himself, become a “threefold cord” (Ecc. 4:12).
One great lesson we learn from Genesis 2:22-24 is that it was God Himself who brought the man and woman together, and in doing so both made, and defined marriage. Marriage is both a divine institution and a creation institution. It is not just for “believers,” or “God’s people,” but for all humans, and indeed, marriage is recognized by people groups of every historical time and culture.