The following is written by Jon Zens, a prolific Reformed writer and authority on New Covenant Theology:

First, 1 Cor.7:1-5 is the only place in the NT where the word “authority” (Greek, exousia) is used with reference to marriage. But it is not the authority of the husband over the wife, or vice versa, that is in view, but rather a mutual authority over each other’s body. 1 Corinthians 7:4 states that the wife has authority over her husband’s body. One would think that this would be a hard pill to swallow for those who see “authority” as resting only in the husband’s headship.

Second, Paul states that a couple cannot separate from one another physically unless there is mutual consent (Greek, symphonou). Both parties must agree to the separation or it doesn’t happen. The husband cannot override the wife’s differing viewpoint.

John Piper suggests that “mature masculinity accepts the burden of the final say in disagreements between husband and wife, but does not presume to use it in every instance” (p.32). The problem with a dogmatic statement like this is that it will allow for no exceptions. But 1 Corinthians 7:5 contradicts Piper’s maxim. If the wife disagrees with a physical separation, the husband cannot overrule his wife with the “final choice” (p.33). Such separation can occur only if both husband and wife are in “symphony” (unity) about such an action.

Now if mutual consent applies in an important issue like physical separation from one another for a period of time, wouldn’t it seem proper that coming to one-mindedness would be the broad model for decision-making in a healthy marriage? Piper feels that “in a good marriage decision-making is focused on the husband, but is not unilateral” (p.32). In light of 1 Corinthians 7:1-5 I would suggest that decision-making should focus on finding the Lord’s mind together. Over the years the good ideas, solutions to problems and answers to dilemmas will flow from both husband and the wife as they seek the Lord as a couple for “symphony.”

1 Corinthians 7:5 throws a wrench into the works for those who would include the husband’s “final say” in male headship. Paul teaches that unless the couple can agree on a course of action, it cannot be executed. I suggest that this revelation invites us to re-examine what the husband’s headship really entails (cf. Gordon D. Fee, “1 Corinthians 7:1-7 Revisited,” Paul & the Corinthians: Studies On A Community in Conflict, Trevor J. Burke/J. Keith Elliott, eds., Brill, 2003, pp.197-213).