When God created the first man Adam, God saw Adam and realized that he needed a mate, so God created Eve, that is, God wanted man to be with his mate and God wanted man to live his married life.
So the Bible says that when a man marries he leaves his parents and reunites with his wife, that is, they reunite in one body and there is no sin in it.
“Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh”(Genesis 2:24)
“6 But from the beginning of creation, ‘God made them male and female.’ 7 ‘Therefore a man shall leave his father and mother and hold fast to his wife, 8 and the two shall become one flesh.’ So they are no longer two but one flesh. 9 What therefore God has joined together, let not man separate”(Mark 10:6-9).
So Paul repeatedly said in his letter that you should not commit immoral sexual sins because those who do such things will never be able to enter the kingdom of heaven and will eventually perish. So Paul says in his letter that if someone cannot live alone he must get married because if someone falls into the trap of sexual sin without getting married then his life will be ruined (Corinthians 7:9).
Bible Verses About Sexual Immorality
Matthew 5:28 “But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart”
Romans 13:13 “Let us walk properly as in the daytime, not in orgies and drunkenness, not in sexual immorality and sensuality, not in quarreling and jealousy”
Leviticus 20:13 “If a man lies with a male as with a woman, both of them have committed an abomination; they shall surely be put to death; their blood is upon them”
1 Corinthians 6:9-11 “9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived: neither the sexually immoral, nor idolaters, nor adulterers, nor men who practice homosexuality, 10 nor thieves, nor the greedy, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God. 11 And such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God”
Romans 1:26-27 “26 For this reason God gave them up to dishonorable passions. For their women exchanged natural relations for those that are contrary to nature; 27 and the men likewise gave up natural relations with women and were consumed with passion for one another, men committing shameless acts with men and receiving in themselves the due penalty for their error”
Hebrews 13:4 “Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous”
Jude 1:7 “just as Sodom and Gomorrah and the surrounding cities, which likewise indulged in sexual immorality and pursued unnatural desire, serve as an example by undergoing a punishment of eternal fire”
Colossians 3:5 “Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry”
1 Corinthians 7:2 “But because of the temptation to sexual immorality, each man should have his own wife and each woman her own husband”
Acts 15:29 “That you abstain from what has been sacrificed to idols, and from blood, and from what has been strangled, and from sexual immorality. If you keep yourselves from these, you will do well. Farewell”
Revelation 9:21 “Nor did they repent of their murders or their sorceries or their sexual immorality or their thefts”
Galatians 5:19-21 “19 Now the works of the flesh are evident: sexual immorality, impurity, sensuality, 20 idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, 21 envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God”
Proverbs 5:15-23 “15 Drink water from your own cistern, flowing water from your own well.16 Should your springs be scattered abroad, streams of water in the streets?17 Let them be for yourself alone, and not for strangers with you.
18 Let your fountain be blessed, and rejoice in the wife of your youth,19 a lovely deer, a graceful doe. Let her breasts fill you at all times with delight; be intoxicated always in her love.20 Why should you be intoxicated, my son, with a forbidden woman and embrace the bosom of an adulteress?
21 For a man’s ways are before the eyes of the Lord, and he ponders all his paths.22 The iniquities of the wicked ensnare him, and he is held fast in the cords of his sin.23 He dies for lack of discipline, and because of his great folly he is led astray”