In I Corinthians 6:11, Paul asserts that the sinful behaviors catalogued in the vice list were formerly practiced by some of the Corinthians. Now, however, since Paul's correspondents have been transferred into the sphere of Christ's lordship, they ought to have left these practices behind: "This is what some of you used to be. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and in the Spirit of our God." The remainder of the chapter, then (I Cor. 6:12-20), counsels the Corinthians to glorify God in their bodies, because they belong now to God and no longer to themselves.
The I Timothy passage includes arsenokoitai in a list of "the lawless and disobedient" whose behavior is specified in a vice list that includes everything from lying to slave-trading to murdering one's parent, under the rubric of actions "contrary to the sound teaching that conforms to the glorious gospel."
One other possibly relevant passage is the apostolic decree of Acts 15:28-29, which rules that Gentile converts to the new Christian movement must observe a list of minimal purity prohibitions in order to have fellowship with the predominantly Jewish early church.
If, as seems likely, these stipulations are based on the purity regulations of Leviticus 17: 1-18:30, then they might well include all the sexual transgressions enumerated in Leviticus 18:6-30, including homosexual intercourse. This suggestion about the Old Testament background for Acts 15:28-29 is probable, but not certain.
Paul is undertaking in his own way to "justify the ways of God to men" by proclaiming that the righteousness of God (dikaiosyne theou) is now definitively manifest in the gospel. As a demonstration of his righteousness, God has "put forward" Jesus Christ, precisely in order "to prove at the present time that he himself (i.e. God) is righteous" (Rom. 3:25-26). For Paul, the gospel that proclaims God's justice is also a power, "the power of God for salvation" reaching out graciously to deliver humanity from bondage to sin and death.
The genius of Paul's analysis lies in his refusal to posit a catalog of sins as the cause of human alienation from God. Instead, he delves to the root: all other depravities follow from the radical rebellion of the creature against the Creator (1:24-31). In order to make his accusation stick, Paul has to claim that these human beings are actually in rebellion against God, not merely ignorant of him. The way in which the argument is framed here is crucial: ignorance is the consequence of humanity's primal rebellion. Because human beings did not acknowledge God, "they became futile in their thinking, and their senseless minds were darkened." The passage is not merely a polemical denunciation of selected pagan vices; it is a diagnosis of the human condition. The diseased behavior detailed in verses 24-31 is symptomatic of the one sickness of humanity as a whole. Because they have turned away from God, "all, both Jews and Greeks, are under the power of sin." The aim of Romans 1 is not to teach a code of sexual ethics; nor is the passage a warning of God's judgment against those who are guilty of particular sins. Rather, Paul is offering a diagnosis of the disordered human condition: he adduces the fact of widespread homosexual behavior as evidence that human beings are indeed in rebellion against their creator. Homosexuality, then, is not a provocation of "the wrath of God" (Rom. 1:18); rather, it is a consequence of God's decision to "give up" rebellious creatures to follow their own futile thinking and desires.