'Fornication' in the Bible

but that we write unto them, that they abstain from the pollutions of idols, and from fornication, and from what is strangled, and from blood.

that ye abstain from things sacrificed to idols, and from blood, and from things strangled, and from fornication; from which if ye keep yourselves, it shall be well with you. Fare ye well.

But as touching the Gentiles that have believed, we wrote, giving judgment that they should keep themselves from things sacrificed to idols, and from blood, and from what is strangled, and from fornication.