1 Corinthians 6:16-18

16Do you not know that he who unites himself with a prostitute is one with her in body? For it is said, “The two will become one flesh.” Gen. 2:24

17But whoever is united with the Lord is one with him in spirit. Or in the Spirit 18Flee from sexual immorality. All other sins a person commits are outside the body, but whoever sins sexually, sins against their own body.