Ephesians 5: Is It Part of the Gospel?

Paul tells Peter, you are not walking according to the truth of the Yewon Gellion. It's explicitly connected to the finished work of Christ on the cross. We don't have the same kind of explicit tethering of marriage, specifically sex, difference in marriage to the term gospel. But maybe Ephesians 5 actually might move us closer to the work of Jesus on the cross and marriage.