'Fornication' in the Bible

It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.

But what I meant was that you were not to associate with any one bearing the name of "brother," if he was addicted to fornication or avarice or idol-worship or abusive language or hard-drinking or greed of gain. With such a man you ought not even to eat.

Meats for the belly, and the belly for meats: but God shall destroy both it and them. Now the body is not for fornication, but for the Lord; and the Lord for the body.

Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.

Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband.

Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.