There is a line which separates God-given desire from sinful craving. Our lives are greatly enriched through viewing the universe which God has created. God has given us much to enjoy. We need to sense when we are crossing the line into sinful desires. Our thoughts are the seedbed for our actions.
Temptation begins in the depths of the human heart.
Each person is enticed by their own evil desire. There is a progression within our thought world, and people who nurture their imagination with images of degradation will experience a desensitization that can eventually bring great harm both to themselves and others when they begin to act out what they are thinking. Evil content cannot help us grow in discipleship. Paul writes that this means giving up unwholesome talk, obscenity, foolish talk or coarse joking. This is a clear encouragement not to let visual media fill our minds with these things.