Why Is Sexual Immorality A Sin & Such A Big Deal To God?

This article today will address the question of why is sexual immorality a sin so that you can maintain your sexual purity and avoid defiling your body with sexual sin that is prevalent today.

There are many reasons why sexual immorality or fornication is a sin and this is what we will cover today in this post as to why you must abstain from any illicit sex before marriage.

Sadly, many people including many so-called Christians indulge in sexual immorality due to a lack of self-control and the lust of the flesh in their sinful hearts that haven’t been dealt with.

This is why we have so many unwanted pregnancies and abortions among many so-called daughters of Zion in the church today as many lack temperance and self-control.

However, if you are a true believer, you are to flee all manner of fornication and sexual immorality as 1 Corinthians 6:18 instructs us because sexual sin comes with grave consequences to all those who commit them.

Sexual immorality isn’t something new because even during the early church in the time of the apostle Paul in the new testament as we see in 1 Corinthians 5:1 it was a big issue among many believers who lacked self-control and were still walking after the flesh, not the Spirit.

However, nowadays, things have gotten out of hand as many people sadly see nothing wrong in involving themselves in any sexual activity before marriage and claim that they can do whatever they want with their bodies.

These people don’t understand that their bodies are not their own and that they are the temple of the Holy Spirit which is one of the reasons why we are told to not defile our bodies with fornication or sexual immorality.

With that said, let’s look at why is sexual immorality a sin that will help you avoid this grievous sexual sin many are involved in so that you don’t ruin your life just because of illicit premarital sex or sexual relations outside marriage.

What Is Sexual Immorality?

According to the bible, sexual immorality is any kind of sexual activity, sexual act, or sexual relations that two people of the opposite sex have outside the confines of marriage where only God permits sex, which includes fornication and adultery.

Sexual immorality defies God’s order of sexual relations and sexuality that He only ordained within the confines of marriage, which is why He frowns upon it as it’s a perversion of this wonderful gift of sex meant only for married couples to enjoy in marriage.

Since the beginning of time, God made sexual intercourse to be performed between two legally married people in marriage, which means that any kind of sex outside marriage is forbidden.

When God created Adam and Eve, He told them to be fruitful and multiply as well as to be one flesh as we are told in Genesis 2:22-24 in the Old Testament. From the verse, we can see from the beginning God meant sex only to be enjoyed between married couples.

However when our first parents fell from grace, it’s where all hell broke loose and all manner of illicit sexual activities God forbid such as adultery, fornication, homosexuality, and all manner of moral perversions started happening.

This is why God had to destroy the old world with the flood because people at that time had become morally corrupt such that they were even having sex with fallen angels resulting in the Nephilim as we see in Genesis 6:1-8.

Related: 54 Godly Relationship Quotes For Sexual Purity [+ Sermon].

Reasons Why Sexual Immorality Is A Sin.

Fornication or sexual immorality is a sin because it is not what God intended for us to do. It is a perversion of the way God created us because it goes against the laws of God and nature.

First, sexual immorality violates the laws of God and nature by violating our physical bodies. Our body is a temple, which means that we are supposed to treat it with respect.

Secondly, sexual immorality also violates the laws of God by violating the sanctity of marriage between one man and one woman (Genesis 2:24; Mark 10:6-9; 1 Corinthians 6:11).

Marriage is ordained by God as a means for procreation (Matthew 19:3-5), which means that sex within marriage should only occur between a husband and wife (1 Corinthians 7:2).

Also, Sexual immorality is a sin because it goes against the purpose for which sex was created. The Bible teaches that sex was designed to be a means of joining a man and woman together in marriage.

This union is meant to be lifelong, so that the couple can raise their children together, teach them how to grow in Christ, and enjoy each other’s company as they age.

When people have sex outside of marriage as in the case of fornication or adultery, which is sex between two married people who are not spouses, they fail to meet this purpose of sex.

Sex within marriage provides many benefits to married couples because it allows them to help each other grow spiritually, helps them bond together emotionally, strengthens their bond with God, and it makes them happier overall.

Related: How To Overcome The Lust Of The Flesh In 7 Easy Steps

What Does God Say About Fornication?

The Bible is clear on this issue of sexuality. God has made it abundantly clear that He does not approve of fornication or any sexual relationship outside of marriage.

In the Bible, there are many different types of sexual relationships that are forbidden by God. Some are listed in Leviticus 20:10 and include incest and adultery.

Others have been added over time, such as homosexuality, bestiality, and all forms of fornication or looking at a woman or the opposite sex lustfully which our Lord Jesus Christ said was adultery in Matthews 5:28.

Fornication means to have sex with someone you are not legally married to which includes premarital sex or any type of sexual activity before marriage between a man and a woman who are not married to each other (1 Corinthians 7:8-9).

God’s word tells us in 1 Thessalonians 4:3-5 that it’s His will that we abstain from fornication and all forms of sexual immorality which includes pornography or all other moral sexual perversions that God is against.

So, if you have been struggling with sexual sin and want to stop sinning against your own body, it’s not too late as you can come to Jesus Christ in repentance for forgiveness and ask Him to give you the grace to help you overcome the desire for fornication.

From there, you need to make a resolve in your heart as a woman that you won’t spread your legs wide open to any man other than your husband or allow any man who’s not your spouse to dump his seed into you.

If you are a man, vow that you won’t release yourself or dump your seed on any woman other than your wife. This means that you need to cut off all immoral boyfriend and girlfriend relationships that make it easy for you to fall into sexual sin ASAP.


I hope the above post on why is sexual immorality a sin has now helped you understand why God views premarital sex as a sin and why you must abstain from it if you love your body and respect your sexuality. In closing, if this post edified you, let me know in the comments below, and don’t forget to share before you leave, and always maintain your sexual purity at all costs.

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