1 Corinthians 7:3-5

A husband has the responsibility of meeting the sexual needs of his wife, and likewise a wife to her husband. Neither the husband nor the wife have exclusive rights to their own bodies, but those rights are to be surrendered to the other. So don’t continue to refuse your spouse those rights, except perhaps by mutual agreement for a specified time so that you can both be devoted to prayer. And then you should resume your physical pleasure so that the Adversary cannot take advantage of you because of the desires of your body.