The short answer to this question is YES.
Modern culture has tried to redefine sexuality as a personal right to be exercised any way an individual wishes. Sexual behavior is considered a personal choice, akin to the decision of whether to buy a house or rent a condo. At the same time, popular opinion has all but removed the word sin from our culture’s vocabulary. The only sexual expression considered “wrong” is what is deemed distasteful to the definer. However, social acceptability varies so greatly that even the vilest of acts would be considered justified by many. So, before we can determine why sexual sin is such a big deal, we have to define sexual sin.
Fortunately, man has never been given the privilege of defining sin. The One who created sexuality also has the right to set the boundaries for it, and the Bible is clear about the guidelines. When God created the first man, Adam, and brought to him the first woman, Eve, He joined them together in marriage and pronounced it “very good” (Genesis 1:31; 2:18, 24).
At that time, God introduced sexuality and set the boundaries for its expression. God created a union between a husband and wife that He called “one flesh” (Genesis 2:24; Matthew 19:6; Mark 10:8; Ephesians 5:31).
He then defined any sexual activity outside of the husband-wife relationship as a violation of His gift. Fornication, homosexuality, pornography, and lust are all violations of God’s intent when He created the sexual act (1 Corinthians 6:9,18; Galatians 5:19-20; Jude 1:7; Matthew 5:28; Hebrews 13:4).
So why is the violation of those boundaries such a big deal? The first clue lies in Genesis 2:24 with the words “one flesh.” There is great unifying power within the sexual union. God designed it to involve not only bodies but hearts and lives. Sex was designed to consummate the lifetime union between a man and woman. Jesus said, “Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.” (Matthew 19:6; Mark 10:9).
God designed male and female bodies differently so that they could come together in an act of physical intimacy that joins them together for life. They “are no longer two, but one flesh” (Mark 10:8). The act of becoming one creates a new entity: a family. This powerful force also brings forth new life (“And Adam knew his wife again; and she bare a son, and called his name Seth”: Genesis 4:25). The human race can only be propagated by the coming together of a man and a woman. And, within marriage, God blesses it (Genesis 1:28; 9:27; Psalm 17:3). Sex is a gift to a husband and wife to make their relationship unique among all other relationships. Once sex takes place between a man and a woman, things change between them instantly because a spiritual manifestation has taken place.
However, what God creates as good, Satan perverts. Satan began his insidious defilement in the Garden of Eden with the words “Hath God said?” (Genesis 3:1). And that challenge to the authority of God continues still. When we use sexuality for entertainment or to satisfy lust, we cheapen the beauty of this powerful gift and defy the One who designed it. We also reap the consequences of our sin. Our sexual disobedience has produced a world staggering under the weight of disease, abortion, perversion, child molestation, addiction, and sexual exploitation. God created boundaries for our good so that we could enjoy His gift as it was designed to be enjoyed.
Electricity is a powerful and helpful thing if used correctly. However, misused or abused, electricity can be deadly. The same is true of sexuality. Misused, sex is also deadly. Abusing God’s gift produces problems such as abortion, poverty, rape, adultery, divorce, pornography, and children growing up without fathers.
Sexual sin begins with temptation, as all sin does. When we refuse to acknowledge God’s boundaries, we allow lust to dictate our choices. And lust never leads in the right direction.
“Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: But every man is tempted, when he is drawn away of his own lust, and enticed. Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death”. James 1:13-15
Another reason sexual sin is such a big deal is that it destroys the picture of the unbreakable covenant God has with His people.
The Bible uses marriage as a metaphor to describe the covenant relationship Jesus has with His “bride,” those whom He has bought with His own blood (Revelation 19:7; 2 Corinthians 11:2).
In the Old Testament, God often compared rebellious Israel to a wayward wife, using adultery as a picture of the most heinous of sins.
“The Lord said also unto me in the days of Josiah the king, Hast thou seen that which backsliding Israel hath done? she is gone up upon every high mountain and under every green tree, and there hath played the harlot”. Jeremiah 3:6
God created the sex act to be a consummation of a covenant relationship—a covenant in which God has participated (Malachi 2:14; Matthew 19:6; Mark 10:9). The marriage covenant illustrates God’s unbreakable covenant with us. To engage in sex outside of marriage violates God’s intention and brings serious consequences.
Sexual sin defiles more than just our physical bodies (1 Corinthians 6:18). It has spiritual significance. Almost every book of the Bible renounces sexual immorality, indicating that God considers it a grave sin. Committing sexual sin is directly opposed to God’s will to sanctify us (1 Thessalonians 4:3).
Romans 13 outlines the life God desires us to live: “Let us walk honestly, as in the day; not in rioting and drunkenness, not in chambering and wantonness, not in strife and envying. But put ye on the Lord Jesus Christ, and make not provision for the flesh, to fulfil the lusts thereof.” Romans 13:13–14
Sexual sin is one more way people gratify the flesh rather than walk in the Spirit of the Lord (Galatians 5:16). Jesus said that the “pure in heart” will “see God” (Matthew 5:8). Unrepentant sexual sin defiles the heart, making it impossible to experience the power of the Holy Spirit in our lives. If we wish to be pure in heart, we cannot engage in sexual sin, but as most do.
“He that is not with me is against me; and he that gathereth not with me scattereth abroad. Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men. And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come”. Matthew 12:30-32