Is it a sin to have sex before marriage?

Tradition	Verdict	Primary Citation
Protestant	Forbidden	1 Corinthians 7:34
Catholic	Forbidden	1 Corinthians 7:36
Eastern Orthodox	Forbidden	Deuteronomy 5:18

Protestant · Christianity

Protestant: Sexual Purity Is Required Outside Marriage

The unmarried woman careth for the things of the Lord, that she may be holy both in body and in spirit: but she that is married careth for the things of the world, how she may please her husband. — 1 Corinthians 7:34

Verdict: Forbidden

Protestant theology has consistently held that sexual intercourse belongs exclusively within the covenant of marriage between a man and a woman. The New Testament doesn't leave much ambiguity here. Paul draws a sharp contrast between the unmarried woman who devotes her body to holiness and the married woman whose attention turns to her husband — implying that the unmarried person's body is meant to remain set apart 1 Corinthians 7:34. That's not a minor lifestyle suggestion; it's framed as a matter of sanctification.

Importantly, Paul also clarifies that marrying is not sinful — in fact, it's the God-given remedy for sexual desire 1 Corinthians 7:28. If a man feels he's behaving dishonorably toward a woman he's betrothed to, the answer Scripture gives is straightforward: "let them marry" 1 Corinthians 7:36. The consistent Protestant reading is that sex outside that marriage covenant crosses a moral line, echoing the older prohibition against adultery that runs through the entire biblical canon Deuteronomy 5:18.

Key takeaways

Christianity across Protestant, Catholic, and Orthodox traditions teaches that sex before marriage is sinful.
1 Corinthians 7:34 calls the unmarried to be holy 'both in body and in spirit,' implying sexual abstinence outside marriage.
Scripture's answer to strong sexual desire is marriage, not premarital sex — 'let them marry' (1 Corinthians 7:36).
The Old Testament commandment against adultery (Deuteronomy 5:18) underpins the broader biblical ethic of sexual faithfulness.
Marriage itself is explicitly declared not sinful (1 Corinthians 7:28), making it the God-ordained context for sexual intimacy.

FAQs

Does the Bible explicitly call premarital sex a sin?

The Bible consistently upholds sexual holiness and reserves physical union for marriage. Paul instructs that the unmarried woman should be holy 'both in body and in spirit' 1 Corinthians 7:34, and when desire is strong, the prescribed solution is marriage — not premarital sex 1 Corinthians 7:36. The prohibition on adultery in the Ten Commandments also reflects a broader ethic of sexual fidelity tied to covenant Deuteronomy 5:18.

Is getting married after premarital sex still valid in Christianity?

Yes. Paul explicitly states 'if thou marry, thou hast not sinned' 1 Corinthians 7:28, indicating that marriage itself is honorable and not tainted by prior moral failures. Christianity generally teaches that repentance and marriage are both available paths forward 1 Corinthians 7:36.

What does the Old Testament say about sexual sin?

The Old Testament lays foundational groundwork with the commandment found in Deuteronomy 5:18: 'Neither shalt thou commit adultery' Deuteronomy 5:18. This commandment, understood broadly in Jewish and Christian tradition, encompasses sexual faithfulness as a core moral obligation 1 Timothy 5:24.

Does Christianity say remaining unmarried is better than marrying?

Some disciples questioned whether it was even 'good to marry' given Jesus's teaching on divorce Matthew 19:10, and Paul does suggest singleness has spiritual advantages 1 Corinthians 7:34. But Paul is clear that marriage is not sinful 1 Corinthians 7:28 — it's a legitimate and holy calling, not a concession to weakness.

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