Passage

23 Then the man said, “This at last is bone of my bones and flesh of my flesh; she shall be called Woman, because she was taken out of Man.”

24 Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh.

Genesis 2:23-24

Genesis 2:23-24 describes a few ways that man and women become "one flesh".

First, the passage describes the physical. The wife is bone of his bone which I take to be connected to the rib God took from him to create women. The wife is flesh of his flesh which I take to mean that women is of like kind with him compared to the other creatures. These two aspects are how Adam named the women, women. She came from man.

Second, the passage describes the steps the man must take. He must leave his father and mother. This is the family that he has known and been lead by his whole life and now he is going be guided directly by God and responsible for his wife.

He then has to hold fast to his wife and become one flesh with her. Hold fast would likely be another way of holding tightly or strongly as something someone cares about that they want to keep safe. This shows the women has value to him above other things in life.

I believe that becoming one flesh is a connection to being intimate with her and joining together physically. It also creates a connection going forward where he needs to think about her body as his own. This intimacy brings them together like how the rib was originally in Adam.

The Narrow Way

How wonderful of God to recognize man’s need for a woman. How corrupt of man to ignore the need for woman. While this world has undervalued God’s design for man and woman Christ gives us the opportunity to live in that original, wonderful relationship of marriage. Men, hold fast to your wife. She was made by God’s hand for you. Do not take for granted this gift from God called marriage. Women support your husband as he leads your family.

Look to God in your marriage and keep him as the center of your relationship.