In Mary's scenario, the wife would have full justification in a ugly divorce case of deciding that in every instance of what had formerly been considered consensual sex, she had indeed been raped, due to power imbalances, inherent societal structural influences of which she had been previously unaware, blablabla.
I've seen extreme feminists who hold this position and who argue it fervently. The sort of people who eagerly lap up the following:
Third, the focus on group-based oppression has also led many radical feminist thinkers to examine the role of rape itself, and of ideologies about rape, in creating and reproducing not only patriarchy but multiple systems of domination, including racism and colonialism.