We see in 1 Thessalonians 4:3-7 that God has not called us to impurity, but in holiness.
Adultery: When a married person has sex with someone other than their spouse.
Sexual immorality: Any sexual expression outside of the covenant of marriage.
Like a guard rail protecting us from danger, the seventh commandment was given to us for our safety.
1 Corinthians 6:9-11
Proverbs 6:27-29, 32-33
1 Corinthians 6:18-20