Women and Sexual Sins
This is a study of what Jesus said in Matthew 5:27-28 (from his so-called "Sermon on the Mount"). This article will attempt to answer the following questions:

What does "lust" mean?
Is "lust" a temptation or a sin?
Is temptation a sin?
Did Jesus teach something new, or did he teach what was from the beginning?
Did Jesus "add to" or "take away" from God's Law?
What is adultery?
Is it a sin to lust after an unmarried woman?
Is it a sin to have sex with an unmarried woman?
Do all sins require a blood sacrifice?
Are spiritual truths represented by physical truths?
What are all the sexual sins listed in scripture?
                                        Four Questions

Please answer the following four questions before proceeding:

If a married man has sex with a married woman (other than ones own wife), is it adultery?
If a married man has sex with an unmarried women, is it adultery?
If an unmarried man has sex with a married woman, is it adultery?
If an unmarried man has sex with an unmarried woman, is it adultery?

Most people would answer the first three questions with a “yes,” and the last question with a “no.” Well, if we were to use “the world's” definition of adultery, those answers would be absolutely correct. However, the definition of adultery in secular dictionaries, including law dictionaries, is contrary to God's definition of adultery as defined in scripture. If you answered these four questions correctly, there should be two “yes's” and two “no's.”
The way you define “adultery” will determine how you interpret Matthew 5:27-28.

What is Adultery?
Let me ask you a question at this point. Please read God's seventh commandment,
"Thou shalt not commit adultery" (Exodus 20:14, Deuteronomy 5:18). What was God referring to? Does He not refer to the sanctity of marriage? Yes, He does. As defined by God, and as will be shown by scripture, Adultery means "sex between a married woman and a man who was not her husband." Or, in other words, adultery means "sex between a man and a married woman." Adultery is of two kinds;

Double, when between a married man and a married woman;
Single, between an unmarried man and a married woman (Leviticus 20:10, Deuteronomy 22:22).

Adultery was punishable by death, and is distinguished from fornication (Exodus 22:16, Deuteronomy 22:28-29). Adultery never involves an unmarried woman. Never. Only a married woman, only a wife (Ezekiel 16:32). Now, let us look more closely at God's 7th and 10th Commandments.

7th Commandment: "Thou shalt not commit adultery." (Exodus 20:14).
10th Commandment: "Thou shalt not covet thy neighbour's wife." (Exodus 20:17).

In other words, this
10th Commandment says that whosoever “covets, desires, or lusts” after a married woman, has committed adultery with her already in ones heart!!! Why? Because one has broken the 7th Commandment already in one's heart! This is the spiritual meaning of adultery, and this is exactly what Jesus meant when he spoke in Matthew 5:27-28.

Matthew 5:27-28, "Ye have heard that it was said by them of old time, Thou shalt not commit adultery: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart."

Was Jesus teaching something new? No, Jesus was not teaching something new. Just as in all the other examples given in Matthew 5 above, Jesus was teaching directly from the Old Testament. The spiritual meanings of the Old Testament laws are also found in the Old Testament itself.

Let me ask you another question. When Jesus was teaching about “adultery” in Matthew 5:27,
"...Thou shalt not commit adultery", was not Jesus also referring to the 7th Commandment and the sanctity of marriage? And when Jesus was teaching about “lusting” after a woman in Matthew 5:28, was not Jesus also referring to the 10th Commandment? Yes, he was.

In God's 7th and 10th Commandments, God refers to the sexual relationship of adultery only. In Matthew 5:27-28, Jesus, referring directly to the Ten Commandments, also refers to adultery only. Jesus was not re-defining the term adultery to mean sexual relationships outside the marriage state. If he was, Jesus was changing God's meaning of this word as used in scripture. Since words define the meaning of law, Jesus would be, in truth, changing the meaning of the words used in God's law, which would be the same as changing God's Law!

If having sex with an unmarried woman is grouped in the same category as those who commit adultery, then this fact should be taught in the Old Testament as well. Otherwise, Jesus would be teaching something completely new and foreign to his listeners.

[Clarification: Just because Exodus 20:14 limits this sin to adultery only, it does not mean adultery is the only sexual sin. We must go to other parts of scripture to see what other sexual acts are also a sin. But we cannot lump them all together and say “adultery” refers to all sexual acts, because it does not have that meaning. Likewise, even though Jesus limited this passage to adultery only, it does not mean adultery is the only sexual sin. We must not put them all in the same category with the same punishment, because God did not do this.]

If Jesus was lumping both married and unmarried women into the same category, that means he changed the penalty of committing sexual acts with these women. As will be shown later in this article, the penalty of adultery was death for both the man and woman. But there was no penalty if an unmarried man and unmarried woman had sex together. The consequences were not death for both…it was marriage for both!
And Jesus would be changing the consequences that God laid down in His law, by replacing the marriage that God ordained with the penalty of death; a penalty that God never gave to unmarried men and women if they had sex together. (Some may claim marriage is death...but that's a different topic).

Whatever is a sin in the Old Testament, is still a sin for us today. And what was not considered a sin in the Old Testament is, likewise, not a sin for us today. God does not say to people, “there will be no punishment if you do this act,” and then later, after people have been doing this same act for thousands of years, suddenly say, “Well, I changed my mind. You cannot do this act anymore, because if you do this act that I previously did not consider a sin before, I will punish and kill you. Sorry.” God does not do that.

Hebrews 13:8, "Jesus Christ the same yesterday, and to day, and for ever"

Malachi 3:6, "For I am the LORD, I change not"

James 1:17, "Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning."

If Jesus was replacing God's Law with a new Law, he would be “adding to” and “taking away” from the Word of God, which would be a sin (Deuteronomy 4:2; 12:32, Proverbs 30:6, Jeremiah 26:2, Revelation 22:18-19), and as we all know, Jesus was without sin (John 8:46; 15:10, Philippians 2:8). Therefore, since Jesus taught nothing new, he must have been teaching the same thing that the Old Testament taught, which is that lusting after married women will cause adultery in one's heart.

Now, knowing Jesus taught nothing new, let us examine Matthew 5:28 further in this Light.


Adultery involves the Marriage State
Matthew 5:28, "But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart."

Now, let's take the first part of this verse,
“…whosoever looketh on a woman to lust after her…” (meaning the intent of looking at her is because you desire her, whether it's sexually or not). Dear reader, is it a sin to lust after all women? Would you include your own wife? No, of course not. But some people would say that lusting after your wife is a sin in certain situations. This will be addressed in the next two paragraph. For now, let's say that it is definitely a sin to lust after some women. So let us continue with this verse to see which women, “…hath committed adultery…”

Now, whoever this “woman” is that Jesus is referring to, she is only the type of woman who may cause adultery. Will your wife cause you to commit adultery if you have sex with her? Obviously not. So, in this specific verse, Jesus could not possibly be referring to ones own wife; he was not teaching that it could be a sin to lust after your own wife. Even if it can be a sin to lust after her in certain situations, this specific verse has nothing to do with that because this passage is dealing with cases of adultery, of which can never happen between a husband and his wife.

Now, some claim that if a married couple has sex for purposes other than to bear children, then they would be defiled. Even though one of the reasons for having sex with your wife is to have children, it is not the only reason. And if it is wrong to have sex with her other than for the purpose of having children, it would contradict Hebrews 13:4,
"Marriage is honourable in all, and the bed undefiled, which states that having sex in marriage is not defiling. Hebrews 13:4 does not say the bed is undefiled only in situations where the couple is making children in bed.

Now, in order to understand which women may cause which men to commit adultery in their heart, we must first establish which women may cause a man to commit adultery in the flesh.
If a woman cannot cause you to commit adultery in the flesh (such as your own wife), then that woman certainly cannot cause you to commit adultery in your heart!

Once we establish which women and which men may cause someone to commit adultery, then we will know more clearly the truth of what Jesus was saying.

Here are the answers to the four questions asked earlier:
If a married man has sex with a married woman (other than ones own wife), is it adultery?
Yes, they were put to death (Leviticus 20:10, Deuteronomy 22:22-24).
If a married man has sex with an unmarried women, is it adultery?
No, she became his wife (Genesis 4:19; 29:23-30; 31:17; 32:22; 36:2,6, Exodus 21:10, Deuteronomy 21:15-17; 25:5-10, Judges 8:30, 1 Samuel 1:2; 25:42-43; 30:18, 2 Samuel 5:13, 1 Kings 11:1-3, 1 Chronicles 4:5; 8:8; 14:3, 2 Chronicles 11:21; 12:7-8; 13:21; 24:3, Daniel 5:2-3).
If an unmarried man has sex with a married woman, is it adultery?
Yes, they were put to death (Leviticus 20:10, Deuteronomy 22:22-24).
If an unmarried man has sex with an unmarried woman, is it adultery?
No, they were commanded to marry each other (Exodus 22:16-17, Deuteronomy 22:28).

As we can see from the above, both married men and unmarried men can commit adultery. Therefore, the “man” referred to in Matthew 5:28 definitely refers to both married men and unmarried men. But what about the woman?

According to scripture, if any man has sex with an unmarried woman, it was not considered adultery! God sentenced married men to death, married women to death, unmarried men to death,
but never does He sentence unmarried women to death for adultery. Adultery can only take place when the woman is married.

Therefore, if an unmarried woman cannot possibly cause a man to commit adultery in the flesh, she cannot possibly cause him to commit adultery in his heart. Or, in other words, if it is not adultery to have sex with an unmarried woman, it cannot possibly be adultery to think about having sex with an unmarried woman.

Now, the following objection might be raised at this point. “But it is fornication to have sex with an unmarried woman, therefore this verse applies to unmarried women as well.” It is true that unmarried women can commit fornication, but we must consider the sexual sin that Jesus describes in Matthew 5:27-28. Jesus was very careful to use the word “adultery,” which can only refer to married women, and not “fornication,” which applies to unmarried women. Thus, Jesus limits this lust to only cases where adultery happens, which only applies to married women, not unmarried women.

In Matthew 5:28, Jesus used the word “adultery,” not “fornication.” These are two different sexual acts, from two different Greek words, with two different definitions. If an unmarried man and unmarried woman have sex, it is never, ever called adultery in scripture. It simply does not have that meaning. The correct term to use is fornication.

Let's look at three different bible dictionaries for verification:

Bible Dictionaries::
Fornication: This word is used in Scripture not only for the sin of impurity between unmarried persons, but for idolatry, and for all kinds of infidelity to God. (American Tract Society Dictionary).
Adultery: Is a criminal connection between persons who are engaged, one or both, to keep themselves wholly to others; and thus it exceeds the guilt of fornication, which is the same intercourse between unmarried persons. Illicit intercourse between a married man and a woman who was not married, nor betrothed, constituted not adultery, but fornication. Fornication may be, in some sense, covered by a subsequent marriage of the parties; but adultery cannot be so healed. (American Tract Society Dictionary).
Adultery: The parties to this crime, according to Jewish law, were a married woman and a man who was not her husband . (Smith's bible dictionary).
Adultery: Conjugal infidelity. An adulterer was a man who had illicit intercourse with a married or a betrothed woman, and such a woman was an adulteress. Intercourse between a married man and an unmarried woman was fornication. (Easton's 1897 bible dictionary).

And secular dictionaries also confirm this meaning:

Secular Dictionaries:
Fornication: 1. Unlawful sexual intercourse on the part of an unmarried person; the act of such illicit sexual intercourse between a man and a woman as does not by law amount to adultery. (Websters Revised Unabridged, 1913 Edition).
Fornication: 1. law: Consenting sex involving somebody unmarried: sexual intercourse between two consenting adults, who are not married to each other. (Encarta World English Dictionary, North American Edition).
Fornication: Date: 14th century: Consensual sexual intercourse between two persons not married to each other. (Merriam Webster Dictionary, 11th Collegiate Edition).
Fornication: Voluntary sexual relations between a man and woman not married to each other. (Wordsmyth Dictionary-Thesaurus).

Fornication: Sexual intercourse between partners who are not married to each other.
WORD HISTORY: The word fornication had a lowly beginning suitable to what has long been the low moral status of the act to which it refers. The Latin word fornix, from which fornicti, the ancestor of fornication, is derived, meant "a vault, an arch." The term also referred to a vaulted cellar or similar place where prostitutes plied their trade. This sense of fornix in Late Latin yielded the verb fornicr, "to commit fornication," from which is derived fornicato, "whoredom, fornication." Our word is first recorded in Middle English about 1303. (The American Heritage Dictionary of the English Language: Fourth Edition).
Fornicate: To have sex with someone you are not married to. (Cambridge Advanced Learner's Dictionary).                                            
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