Matthew 5:28
but I tell you, that every one who looks on a woman to desire her inordinately, has already committed adultery with her in his heart.
1 Corinthians 6:9-11
Know you not that the unjust shall not inherit the kingdom of God? Be not deceived; neither fornicators, nor idolaters, nor adulterers, nor the effeminate, nor sodomites,
1 Corinthians 10:20
But what the gentiles sacrifice, they sacrifice to demons, and not to God; and I do not wish you to be partakers with demons.
Galatians 5:19-21
For the works of the flesh are manifest, which are, fornication, impurity, lewdness,
Hebrews 13:4
Marriage is honorable in all, and married life without blame; but fornicators and adulterers God will judge.