1 Corinthians 7:2-4

But because sexual sin is a danger, each man should have his own wife, and each woman should have her own husband. The husband should give his wife all that he owes her as his wife. And the wife should give her husband all that she owes him as her husband. The wife does not have full rights over her own body; her husband shares them. And the husband does not have full rights over his own body; his wife shares them.