Matthew 5:28
But I say to you, That whoever looks on a woman to lust after her has committed adultery with her already in his heart.
Topicalbible.org—AKJV

1 Corinthians 6:18
Flee fornication. Every sin that a man does is without the body; but he that commits fornication sins against his own body.
Topicalbible.org—AKJV