This is not great, inspirational literature. This is a simple, direct warning from God. It has already been stated in the Ten Commandments:
(Exodus 20:14 KJV) Thou shalt not commit adultery.You would think that is clear enough but our society doesn’t want to hear.
Understand that there is no sneaking that God cannot see. You cannot get away with it. It will not “be innocent" (go unpunished NASB) (5352). In case that isn’t clear let me expand it a little: Adultery will make your life hell now and put you in the eternal Hell later.
So? I hope this does not apply to you. If you are tempted, take it seriously. Let’s move on.