Is Every Sin outside the Body except Immoral Sex? Weighing Whether 1 Corinthians 6:18b Is Paul’s Statement or a Corinthian Slogan

In 1 Cor 6:18b–c, Paul writes, “Every sin, whatever a person commits, is outside the body, but the sexually immoral person sins against his own body.” This essay weighs whether 1 Cor 6:18b is Paul’s statement or whether Paul is quoting a Corinthian slogan, and it concludes that the second view is more plausible.