1 Corinthians 6:15-18 NIV

[15] Do you not know that your bodies are members of Christ himself? Shall I then take the members of Christ and unite them with a prostitute? Never! [16] Do 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.” [17] But whoever is united with the Lord is one with him in spirit. [18] Flee from sexual immorality. All other sins a person commits are outside the body, but whoever sins sexually, sins against their own body.