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Not unless you assume that the wife owes him sex, which she does not. At no time EVER do women OWE men sex. Or vice versa. Sex is about desire and love. And if she's not feeling loving or desirous then it is crap to expect it out of her. I don't know where in the world anybody, man or woman, would get off assuming that the world owes them some nookie, but it most certainly does not.
It is common to read a few words from First Corinthians Chapter 13 ("Love is patient, love is kind....").
Obviously, these people are pretty far off the mark on love, which is kind of the main issue. But, Chapter 7 of the same book addresses the deliberately withholding of sex:
The husband should fulfill his marital duty to his wife, and likewise the wife to her husband. The wife's body does not belong to her alone but also to her husband. In the same way, the husband's body does not belong to him alone but also to his wife. Do not deprive each other except by mutual consent and for a time, so that you may devote yourselves to prayer. Then come together again so that Satan will not tempt you because of your lack of self-control...(NIV)
I don't want to start a religious war; I hope everyone can get something out of this regardless of their religious orientation. I just think that sex really is a ( mutual) marital obligation (how we hate that word!), and this expresses it pretty elequently in a non-sexist way.
Of course, it would be cruel to expect sex from a spouse who is puking up blood from the flu or something, and treating one's spouse cruelly is not good for intimacy, but, aside from such reasonable issues, deliberate deprivation by either spouse has historically been considered wrong, and perhaps for good reason.