If the husband refuses to spend on his wife’s maintenance, is it permissible for her to refuse to share his bed?

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Check below answers in case you are looking for other related questions:
What are the rights of the husband and what are the rights of the wife?
If a married son does not live with his mother, is he regarded as being disobedient towards her?

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What are the rights of the husband and what are the rights of the wife?
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