1 Corinthians 7:1-5

Now, to deal with the matters you wrote about. A man does well not to marry. But because there is so much immorality, every man should have his own wife, and every woman should have her own husband. A man should fulfil his duty as a husband, and a woman should fulfil her duty as a wife, and each should satisfy the other's needs. A wife is not the master of her own body, but her husband is; in the same way a husband is not the master of his own body, but his wife is. Do not deny yourselves to each other, unless you first agree to do so for a while in order to spend your time in prayer; but then resume normal marital relations. In this way you will be kept from giving in to Satan's temptation because of your lack of self-control.