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Yes, you can rape your wife. It still works the same way as in normal rape, regardless of how you think sex in marriage should function.
With that said, if a woman continually denies sex to her husband, then the husband should be allowed to openly neglect his husbandly duties, as well. Mainly in the form of providing her with other resources (money, food, shelter, etc). Especially if he's the primary breadwinner.