Paul chose to set the controlling verb of this section in v. 21 "be being in submission to one another, in the fear of Christ." That pours over into his teaching to husbands and wives. The order is the reverse, but the weight of instruction falls mostly on husbands. Paul has changed his outlook on marriage from 9 years previous in 1 Cor. 7, to the point where he must apostically address the exploding churches in Asia Minor regarding God's "house law."