I wrote to you in my letter not to associate with sexually immoral people - not at all meaning the sexually immoral of this world, or the greedy and swindlers, or idolaters, since then you would 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 if he is guilty of immorality or greed, or is an idolater, reviler, drunkard, or swindler - not even to eat with such a one. For what have I to do with judging outsiders? Is it not those inside the church whom you are to judge? God judges those outside. 'Purge the evil person from among you."
Plain & Simple
We need to be aware of the actions and lifestyles of our brothers & sisters in Christ. Not to be nosey, but to be aware of their immorality in order to correct and to save that person's soul from destruction. The world has become comfortable with immorality, however we must NOT accept it!