“But as I have previously suggested, it is somewhat naive to think that economic equality alone would equalize the power balance of a marriage. Economic emancipation is surely to be applauded—is indispensable really—but as long as older women are viewed as sexually less desirable than older men, a power imbalance will continue to exist, one that will continue to influence women to hold their tongues, keep the peace, and take the responsibility for pre- serving the marriage.”