1 Corinthians 7:2-5

But because sexual immorality is so common, each man should have sexual relations with his own wife, and each woman should have sexual relations with her own husband. A husband should fulfill his marital duty to his wife, and likewise a wife to her husband. A wife does not have the right over her own body, but her husband does. In the same way, a husband does not have the right over his own body, but his wife does. Do not deprive one another — except when you agree for a time, to devote yourselves to prayer. Then come together again; otherwise, Satan may tempt you because of your lack of self-control.