I find it interesting how Paul an unmarried man can give the kind of instructions he did in these verses. To say something about that I want to carry us in thought to the ninth chapter of Acts where Jesus told Ananias, "He must bear my name to the Gentiles and kings and the children of Israel." In order to do this Paul had to have instructions. In Ephesians 3:3 Paul calls it revelation which carries in it the root word "reveal". In the letters of Paul we have the truth as Christ by revelation revealed the complete teaching of truth as to how God's people "the Church" was to exist in this world.
So why not Christ's teaching about marriage. However modern man thinks he knows more than God. We have marriages ending in divorce , gay marriages and what is next. Simply because mankind does not want to comply with the ways of God. Now I didn't do anything about this interpretation. Read it yourself.