1 Corinthians 6:15-18

Riverside(i) 15 Do you not know that your bodies are members of Christ? Shall I then take the members of Christ and make them members of a prostitute? Never! 16 Do you not know that he who unites himself to a prostitute is one body with her? For God says, "The two shall become one flesh." 17 He who is united to the Lord is one spirit. 18 Shun unchastity. Every other sin that a man does is apart from the body, but the unchaste sins against his own body.