Who are the "unrighteous" (NASB) or "wicked" (NIV) in view? Paul previously used this word (Gr. adikos) of the unsaved in 1 Corinthians 6:1 (cf. 1 Corinthians 6:6 where he called them unbelievers). However he also used it of the Corinthian Christians in 1 Corinthians 6:8 : "you yourselves wrong [1]." Christians as well as unbelievers have been guilty of unrighteous conduct, even all the offenses listed in these verses. Therefore what Paul said about the unrighteous in this verse seems to apply to anyone who is unrighteous in his or her behavior whether saved or unsaved. It does not apply just to the unrighteous in their standing before God, namely, unbelievers. Some interpreters, however, have concluded that the unrighteous refer only to unbelievers. [2][source]
What will be true of the unrighteous? They will "not inherit the kingdom of God." Jesus explained who will inherit the kingdom ( Matthew 5:3; Matthew 5:10; Mark 10:14), whereas Paul explained who will not. Elsewhere Paul used this expression to describe the consequences of the behavior of unbelievers when he compared it to the behavior of believers (cf. Galatians 5:21; Ephesians 5:5). That appears to be its meaning here too. [3] Inheriting the kingdom and entering the kingdom are synonyms in the Gospels (cf. Matthew 19:16; Mark 10:17; Luke 18:18). Paul was apparently contrasting what the Corinthians did before their conversion with their conduct after conversion ( 1 Corinthians 6:11). He did not mean that Christians are incapable of practicing these sins but that they typically characterize unbelievers. Paul was exhorting the Corinthian believers to live like saints. [4][source]
Paul warned his readers about being deceived on this subject ( 1 Corinthians 6:9). Probably many of them failed to see that how Christians choose to live here and now will affect our eternal reward. Many Christians today fail to see this too. The fact that we are eternally secure should not lead us to conclude that it does not matter how we live now even though we will all end up in heaven. [source][source][source]
The meanings of most of these sins are clear, but a few require some comment. "Effeminate" (NASB) or "male prostitutes" (NIV Gr. malakoi) refers to the passive role in a homosexual union whereas "homosexuals" refers to the active role. [5] David Malick showed that Paul was condemning all homosexual relationships, not just "abuses" in homosexual behavior. [2][source]
"Bisexuality was extremely common among Greeks, especially because of the shortage of available wives, which apparently occasioned the late age of marriage for most Greek men." [7][source]
"We can scarcely realize how riddled the ancient world was with it [8]. Even so great a man as Socrates practised [9] it; Plato"s dialogue The Symposium is always said to be one of the greatest works on love in the world, but its subject is not natural but unnatural love. Fourteen out of the first fifteen Roman Emperors practised unnatural vice." [10][source]
Note the seriousness of the sin of covetousness or greed (cf. 1 Corinthians 5:10-11; 1 Corinthians 6:8). Greed may manifest itself in a desire for what one should not have ( Exodus 20:17; Romans 7:7) or in an excessive desire for what one may legitimately have ( Ephesians 5:5; Colossians 3:5). [source][source][source]
"The universality of wine drinking was of course due to the inadequate water-supplies. But normally the Greeks were sober people, for their drink was three parts of wine mixed with two of water." [11][source]
"The order of the ten kinds of offenders is unstudied. He enumerates sins which were prevalent at Corinth just as they occur to him." [12][source]