'Immorality' in the Bible

It is actually reported [everywhere] that there is sexual immorality among you, a kind of immorality that is condemned even among the [unbelieving] Gentiles: that someone has [an intimate relationship with] his father’s wife.

But actually, I have written to you not to associate with any so-called [Christian] brother if he is sexually immoral or greedy, or is an idolater [devoted to anything that takes the place of God], or is a reviler [who insults or slanders or otherwise verbally abuses others], or is a drunkard or a swindler—you must not so much as eat with such a person.

Food is for the stomach and the stomach for food, but God will do away with both of them. The body is not intended for sexual immorality, but for the Lord, and the Lord is for the body [to save, sanctify, and raise it again because of the sacrifice of the cross].

Run away from sexual immorality [in any form, whether thought or behavior, whether visual or written]. Every other sin that a man commits is outside the body, but the one who is sexually immoral sins against his own body.

But because of [the temptation to participate in] sexual immorality, let each man have his own wife, and let each woman have her own husband.

We must not indulge in [nor tolerate] sexual immorality, as some of them did, and twenty-three thousand [suddenly] fell [dead] in a single day!