1 Corinthians 7:3-8

The husband should give to his wife her conjugal rights (goodwill, kindness, and what is due her as his wife), and likewise the wife to her husband. For the wife does not have [exclusive] authority and control over her own body, but the husband [has his rights]; likewise also the husband does not have [exclusive] authority and control over his body, but the wife [has her rights]. Do not refuse and deprive and defraud each other [of your due marital rights], except perhaps by mutual consent for a time, so that you may devote yourselves unhindered to prayer. But afterwards resume marital relations, lest Satan tempt you [to sin] through your lack of restraint of sexual desire. [Exod. 19:15.] But I am saying this more as a matter of permission and concession, not as a command or regulation. I wish that all men were like I myself am [in this matter of self-control]. But each has his own special gift from God, one of this kind and one of another. But to the unmarried people and to the widows, I declare that it is well (good, advantageous, expedient, and wholesome) for them to remain [single] even as I do.