And such fornication which is not named among the heathen, so as for one to have his father's wife. 1 Cor 5:1

For as many as have sinned without law shall also perish without the law: and as many as have sinned under the law shall be judged by the law; Romans 2:12 ASV

Fornication is not adultery and adultery is not fornication. 

They are listed as separate sexual sins in the Bible. 1 Corinthians 5:1 defines fornication. Both adulterers and fornicators, and all who commit other sexual sins, will not be saved. 1 Corinthians 6:9.

1 Corinthians 6:9 KJV
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind.

Galatians 5:19 KJV
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness.

IF WE FORNICATE WITHOUT KNOWLEDGE OR BY MISINTERPRETATION WE WILL NOT BE SAVED. ROMANS 2:12. 

Knowing that no fornicator will be saved, what is Biblical Fornication?

(1) Everywhere it is heard that fornication is among you, and such fornication which is not named among the heathen, so as for one to have his father's wife. 1 Corinthians 5:1 LITV

1 Corinthians 5:1 teaches what fornication is

Paul deplored the sexual relationship which involves a son and his stepmother, the woman (wife) of his father.

Paul should have referred to the relationship of the stepmother and the stepson as adultery as defined in Leviticus 20:10, but he did not because the sexual relation was not with a stranger or a neighbor but within the family.

And the man that committeth adultery with another man's wife, even he that committeth adultery with his neighbor's wife, the adulterer and the adulteress shall surely be put to death. Leviticus 20:10 ASV


(10) And Jesus lifted up himself, and said unto her, Woman, where are they? did no man condemn thee?
(11) And she said, No man, Lord. And Jesus said, Neither do I condemn thee: go thy way; from henceforth sin no more. John 8:10-11 ASV

Besides having sex with the woman of another man, there are other sexual relations which God Jesus forbids. The forbidden sexual relations are primarily listed in Leviticus chapter 18. The forbidden sexual relation of 1 Corinthians 5:1 which is called fornication (porneia) is sanctioned in Leviticus 18:8.

The nakedness of thy father's wife [woman] shalt thou not uncover: it is thy father's nakedness. Leviticus 18:8 ASV

And the man that lieth with his father's wife [woman] hath uncovered his father's nakedness: both of them shall surely be put to death; their blood shall be upon them. Leviticus 20:11 ASV


Therefore, fornication is the adoption of the forbidden sexual relationships in Leviticus 18 and elsewhere in Moses. The forbidden sexual relations in Leviticus 18 are called fornication not adultery which involves touching the woman of another man and which is the only cause for divorce.

And I say unto you, Whosoever shall put away his wife [woman], except for fornication, and shall marry another, committeth adultery: and he that marrieth her when she is put away committeth adultery. Matthew 19:9 ASV

Deuteronomy 13:11 ASV
(11) And all Israel shall hear, and fear, and shall do not more any such wickedness as this is in the midst of thee.

Deuteronomy 17:13 ASV
(13) And all the people shall hear, and fear, and do no more presumptuously.

Deuteronomy 19:20-21 ASV
(20) And those that remain shall hear, and fear, and shall henceforth commit no more any such evil in the midst of thee.
(21) And thine eyes shall not pity; life shall go for life, eye for eye, tooth for tooth, hand for hand, foot for foot.

Death penalty for sins in Moses was only to be enforced in Israel to bring fear in the Israelites, but the specter of stoning to death did not dissuade them unto obedience (John 8:1-11).

Deuteronomy chapter 13 is the backdrop for the persecution by Apostle Paul of the first Christacolytes who followed Christian Judaism (the Judaism of Jesus). Apostle Paul formerly believed that they were idolatrous believers spreading false teachings of apostasy from the Judaism of Moses, until Jesus stopped him and convinced him to understand that He is "I AM', YAHWEH their Elohim in flesh, the Messiah (John 8:24, Exodus 3:13-15), whom Paul calls 'the glorious and great God and Saviour of us' in Titus 2:13.

The true voice of Jesus of Nazareth

AS BELIEVERS IN JESUS, WHAT IS AT STAKE BECAUSE OF OUR SEX LIFE?

OUR SALVATION IS AT STAKE FOR SURE, IF WE FOLLOW MISINFORMATION ON ANY DOCTRINE OF JUDAISM SUCH AS FORNICATION AND ADULTERY OR IGNORE THEM TO SIN SEXUALLY. ROMANS 2:12 IMPLIES THAT GOD WILL NOT EXCUSE IGNORANCE OR MISUNDERSTANDING WHICH LEADS TO SIN.