Dennis Prager (Jewish, not Christian) refuses to admit that lust is sinful — thoughts. Only an adulterous act can be sinful and evil, never lustful thoughts, he believes.
Compare to what Jesus warned in the strongest terms in Matthew 5:
27 “You have heard that it was said to those of old [old covenant] – Dennis Prager’s mindset], ‘You shall not commit adultery.’ 28 But I say [new covenant] to you that WHOEVER LOOKS AT A WOMAN TO LUST for her has already COMMITTED ADULTERY WITH HER IN HIS HEART. 29 If your right EYE causes you to sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, THAN FOR YOUR WHOLE BODY TO BE CAST INTO HELL. 30 And if your RIGHT HAND causes you to sin, cut it off and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be CAST INTO HELL.