Short answer: No. Sex is not a sin in the Bible. God created it and called his creation very good, and he designed it as a gift for one man and one woman in the lifelong covenant of marriage. Sex becomes sin when it is taken outside that covenant, as in adultery, sex before marriage, or any act the Bible forbids.
In This Article
Some people grew up thinking the church sees sex as dirty or shameful. Others have heard the reverse, that anything goes if two people agree. Neither picture matches Scripture. The Bible speaks about sex with honesty and with joy, and it also draws clear lines. I will try to be frank and careful, as the subject deserves.
Below I look at what God says about sex in creation, in marriage, what the Bible forbids and why, and how unmarried believers can handle desire faithfully.
What Does The Bible Say About Sex?
The Bible begins with God creating humanity male and female, and then, looking at everything he had made, calling it very good.
God saw all that he had made, and it was very good.
Genesis 1:31 (NIV)
Our bodies and our design as sexual beings are part of that. God's first words of blessing to the man and woman included the command to be fruitful and increase in number (Genesis 1:28). That command cannot be carried out without sex. In the story of the first couple, Adam and Eve were naked and felt no shame (Genesis 2:25), and soon after Adam made love to his wife Eve and she conceived (Genesis 4:1).
The foundation for marriage comes right after the creation of Eve.
That is why a man leaves his father and mother and is united to his wife, and they become one flesh.
Genesis 2:24 (NIV)
"One flesh" describes a physical, emotional and spiritual union. Jesus pointed to this very text when he taught about marriage (Matthew 19:4-6). So sex is part of how God joins a husband and a wife.
Is Sex A Sin Inside Marriage?
No, and the Bible goes further than permitting it. It encourages marriage partners to enjoy one another and not to withhold themselves.
The husband should fulfill his marital duty to his wife, and likewise the wife to her husband.
1 Corinthians 7:3 (NIV)
Proverbs tells a husband to rejoice in the wife of his youth (Proverbs 5:18-19), and the Song of Solomon is a whole book celebrating married love. Hebrews gives the standard in a sentence.
Marriage should be honored by all, and the marriage bed kept pure
Hebrews 13:4 (NIV)
The marriage bed is kept pure, not avoided. That verse continues with a warning that God will judge the adulterer and the sexually immoral, so the same verse that honours sex in marriage rules out sex outside it. Marriage is also the picture God uses for Christ and his church. A faithful marriage shows something of God's own faithfulness and love.
Is Sex Before Marriage A Sin?
The Bible's answer is yes. It uses the Greek word porneia for sexual immorality, which covers sex outside the marriage covenant, and it tells believers to flee from it.
Flee from sexual immorality.
1 Corinthians 6:18 (NIV)
Paul gives a reason: sexual sin is a sin against our own body, because sex involves the whole person. 1 Thessalonians 4:3-4 says it is God's will that believers avoid sexual immorality and learn to control their bodies in a way that is holy and honourable. I know this is not a popular teaching. I also know that the Bible gives it for our good, because sex was made to bind two people for life, and when it is separated from that promise it tends to wound. You can read the full discussion in Is Premarital Sex A Sin? and Is Living Together Outside Of Marriage A Sin?, as well as defining porneia.
What Sexual Acts Does The Bible Forbid?
Beyond sex before marriage, the Bible names several wrongs. Adultery, sex with someone else's spouse, is condemned in the seventh commandment and elsewhere. Leviticus 18:6-23 lists forbidden relationships, including incest, and the law in Leviticus 20:10-12 set severe penalties in Israel's civil system for adultery and some of these acts. Jesus taught that even lustful looking is a heart sin (Matthew 5:28). Rape is violence and was treated with the utmost seriousness. Under the law, a man who seduced a young woman who was not engaged was required to pay the bride price and marry her if her father agreed (Exodus 22:16), which shows that sex was never treated as a casual matter.
Where readers ask about specific acts, I have written separately on oral sex, anal sex and masturbation. For a broader map, see What Sexual Activities Does The Bible Forbid?, sexual immorality in the Bible and examples of sexual sin. I also keep lust separate, because it is where many battles begin.
How Can Unmarried Christians Handle Sexual Desire?
Desire is not itself a sin. It is part of how God made us. The challenge is how we steward it. Here are a few steps that I would suggest, each a matter of wisdom more than law.
- Be honest about the pull. Pretending it is not there makes it stronger. Name it to God.
- Avoid tempting situations. Decide your boundaries before the moment arrives, and ask a trusted believer to hold you accountable.
- Look at what sits beneath it. Often what we want is closeness, comfort or relief from loneliness. Find the real need and meet it in healthy ways.
- Pray often. Bring the desire to God and ask for help. He knows you and can carry you through.
If you have fallen, you are not beyond forgiveness. Paul wrote to people in Corinth with a long record of sin and told them that was what some of them were, but they had been washed, sanctified and justified (1 Corinthians 6:11). Confess it, turn, and go on. If it helps, see how to repent.
What About The Worst And Unforgivable Sins?
Readers often ask, after a question like this, whether sexual sin is the worst of all, or whether some sin can never be forgiven. The Bible does say sexual sin harms us in a unique way, but it does not put it beyond forgiveness. The only sin Jesus says will not be forgiven is blasphemy against the Spirit, which I explain in the unforgivable sin, and I discuss the whole matter of ranking in What Is The Greatest Sin In The Bible? As for saying "Oh my God," that is a separate question about God's name, covered in its own article.
Key Bible Verses About Sex
- Genesis 1:31: God looked at all he had made, and it was very good.
- Genesis 2:24: a man and his wife become one flesh.
- Proverbs 5:18-19: rejoice in the wife of your youth.
- 1 Corinthians 7:3: husband and wife are to give themselves to each other.
- Hebrews 13:4: honour marriage and keep the marriage bed pure.
- 1 Corinthians 6:18: flee from sexual immorality.
- 1 Thessalonians 4:3-4: God's will is that believers avoid sexual immorality and control their bodies.
- 1 Corinthians 6:11: washed, sanctified and justified: forgiveness for the sexually sinful too.
Frequently Asked Questions
Is sex a sin if you are not married?
Yes. The Bible treats sex outside of marriage as sexual immorality and tells believers to flee from it. It is not because sex is dirty, but because God designed it for the lifelong covenant of marriage. See Is Premarital Sex A Sin?
What does the Bible say about sex?
It says sex is a good gift from God for a husband and wife, the way two become one flesh. It also warns against adultery and sexual immorality and calls for self-control from those who are unmarried.
Is oral sex a sin in the Bible?
The Bible does not name it directly. What matters is whether it stays within marriage, is mutual and honours both spouses. I look at the question carefully in Is Oral Sex A Sin In The Bible?
What sins will God never forgive?
Jesus names only one, blasphemy against the Holy Spirit, which is a hardened refusal to accept Christ. Sexual sin is forgivable when confessed and turned from. See the unforgivable sin.
What is the number one worst sin?
The Bible does not rank one sin as the worst, though it treats rejecting Christ as the one that finally cannot be forgiven. I explain this in What Is The Greatest Sin In The Bible?
