Chapter 5 treats the love of man and woman as part of the structure of creation, not as a merely private attachment. Men and women are born for each other so that God’s love can become embodied in their union and give the universe a visible model of true love.
The chapter also presses a strong anti-self-centered argument. Love does not begin from the self but from the partner, which means conjugal life teaches humility, service, and living for the sake of the other.
Its more explicit bodily language is in service of a theological claim: the bodily union of man and woman is one of the places where love, harmony, and lineage become historically real.