Why is living together before marriage considered living in sin?

Speaking of relationship goals, should living together before marriage be one of them? Is living together a sin? What does the Bible say about cohabitation and sex before marriage? If one is considering moving in with a boyfriend, or moving in with a girlfriend, they really need to understand what the Bible says about fornication and living in sin.
SOURCE: Got Questions Ministries - https://www.youtube.com/@gotquestions

Genesis 2:24 (ESV) 
24 Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh. 

 Ephesians 5:3 (ESV) 
3 But sexual immorality and all impurity or covetousness must not even be named among you, as is proper among saints.
Acts 15:20 (ESV)
20 but should write to them to abstain from the things polluted by idols, and from sexual immorality, and from what has been strangled, and from blood.

1 Corinthians 5:1 (ESV)
5 It is actually reported that there is sexual immorality among you, and of a kind that is not tolerated even among pagans, for a man has his father’s wife.

1 Corinthians 6:13 (ESV)
13 “Food is meant for the stomach and the stomach for food”—and God will destroy both one and the other. The body is not meant for sexual immorality, but for the Lord, and the Lord for the body.

1 Corinthians 6:18 (ESV)
18 Flee from sexual immorality. Every other sin a person commits is outside the body, but the sexually immoral person sins against his own body.

Colossians 3:5 (ESV)
5 Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry.

2 Corinthians 12:21 (ESV)
21 I fear that when I come again my God may humble me before you, and I may have to mourn over many of those who sinned earlier and have not repented of the impurity, sexual immorality, and sensuality that they have practiced.

Galatians 5:19 (ESV)
19 Now the works of the flesh are evident: sexual immorality, impurity, sensuality,

1 Thessalonians 4:3 (ESV)
3 For this is the will of God, your sanctification: that you abstain from sexual immorality;

1 Corinthians 10:8 (ESV)
8 We must not indulge in sexual immorality as some of them did, and twenty-three thousand fell in a single day.

Matthew 19:5 (ESV)
5 and said, ‘Therefore a man shall leave his father and his mother and hold fast to his wife, and the two shall become one flesh’?

Hebrews 13:4 (ESV)
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.


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