The reason many men watch pornography is that their sex life at home is boring, the wife is frigid or unenthusiastic, or that the spark has gone out of your marriage. The solution is to put that needed romantic spark back in your marriage.
There is no way a demon could leap out of a monitor and possess a viewer. However, a boring marital relationship is a certain way to assure that he takes prurient delight in other women.
The solution is to get over your hangups, Kylesbaby. If he wants to watch pretty girls on a TV monitor, watch with him. What she does on screen, do it better. Be the sparkling lover you were when you met, and rest assured, you will enjoy it far more than he.
If that seems like a second honeymoon, then have it at home. As soon as he is back from work, the kids are off doing what they should be doing, grab him by the shirt, drag him to the bathroom, bring out a bar of soap, a smile and a giggle, then let nature take its beneficial and remedial course.
Honey, if you don't, then don't blame him for finding someone else, who will do that for him.