What human nature does. Paul is talking about the evil side of our human nature, not ordinary human desires and needs. Even Christians still have this evil side, as the case of the Galatian Christians show. The Devil tries to use this side of us to seduce us to sin!!! Immoral. Sex acts outside the marriage relationship [fornication]. Filthy. Such things as pornography, that lead to adultery, homosexuality, and immorality in general. Indecent actions. Sinning openly and not caring who knows it! The sort of things that shocks public morals.

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Old Testament