1 Cor 6:15

6:15 your bodies are members of Christ. The doctrine of the believer’s union with Christ is one of the most fundamental teachings of the apostle. What is significant about this verse is that it represents that union as involving the whole person, not only the body (Rom. 12:1). The Corinthians are wrong in thinking that sexual union with a prostitute, just because it is physical, does not affect their relationship with Christ.