The husband is the head of his wife as Christ is the Head of the Church. The body of a mad man though incorrect is still subject to his head. So, godly wives are expected to be subject to their husbands.
“Wives, submit yourselves unto your own husbands, as unto the Lord. For the husband is the head of the wife, even as Christ is the Head of the church: and He is the Saviour of the body. Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing.” – Eph.5: 22-24