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1 Corinthians 6:15-16

New International Version (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.”

From BibleGateway.com: http://www.biblegateway.com/passage/?search=1 corinthians 6:15-16&version=NIV