"In this same way, husbands ought to love their wives as their own bodies. He who loves his wife loves himself. After all, no one ever hated his own body, but he feeds and cares for it, just as Christ does the church - for we are members of his body." NIV translation
Now, Paul turns to the third aspect (strand) of a marriage and that is the physical relationship. Although we all have different things that we would like to change about our bodies, we still love and take care of ourselves. The same is true for a married couple in that they can and should take care of each other's physical needs. One of the biggest problems today is that too many people skip the spiritual and mental aspects and get right to the physical. This may seem to work for a period of time but, without all three strands, the rope of the marriage will break.