I wrote to you in my letter not to associate with sexually immoral persons— not at all meaning the immoral of this world, or the greedy and robbers, or idolaters, since you would then need to go out of the world. But now I am writing to you not to associate with anyone who bears the name of brother or sister who is sexually immoral or greedy, or is an idolater, reviler, drunkard, or robber. Do not even eat with such a one. For what have I to do with judging those outside? Is it not those who are inside that you are to judge? God will judge those outside. “Drive out the wicked person from among you.”
—1 Corinthians 5.9–13
Oh what a loving and common sense principal for how to engage the sexual immorality of others. Paul sounds like such a liberal (or the Pope, haha) here when he says that it is not his place to judge or condemn those outside the church. He in essence says that they are acting exactly as they should act. There should be no shock, surprise, or offense at “the culture” acting like “the culture”. No railing against the immorality of society. Instead, work to foster purity among the people of God. We are to be more eager to spend time with the “immoral” outside the church then the immoral inside the church.