The marriage bed should be a place of mutuality with the husband seeking to satisfy his wife and the wife seeking to satisfy her husband. Marriage is not a place to stand up for your rights. There must be a conscious decision to serve the other, whether in or out of bed.
The wife does not have authority over her own body but yields it to her husband. In the same way, the husband does not have authority over his own body but yields it to his wife. Do not deprive each other except perhaps by mutual consent and for a time.