Matthew 5:28
But I say to you that every one who looks at a woman lustfully has already committed adultery with her in his heart.
1 Corinthians 6:9-11
Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither the immoral, nor idolaters, nor adulterers, nor sexual perverts,
1 Corinthians 10:20
No, but I say that the things pagans sacrifice they offer to demons and not to God. I do not want you to be partners with demons.
Galatians 5:19-21
Now the deeds of the flesh are obvious: immorality, impurity, lewdness,
Hebrews 13:4
Let marriage be held in honor among all, and let the marriage bed be undefiled; for God will judge the immoral and adulterous.