Matthew 5:28
But I tell you, any one who even looks with lust at a woman has committed adultery with her already in his heart.
1 Corinthians 6:9-11
What! do you not know that the wicked will not inherit the Realm of God? Make no mistake about it; neither the immoral nor idolaters nor adulterers nor catamites nor sodomites
1 Corinthians 10:20
No, what I imply is that anything people sacrifice is sacrificed to daemons, not to God. And I do not want you to participate in daemons!
Galatians 5:19-21
Now the deeds of the flesh are quite obvious, such as sexual vice, impurity, sensuality,
Hebrews 13:4
Let marriage be held in honour by all, and keep the marriage-bed unstained. God will punish the vicious and adulterous.