if you let it control your mind, aka if you give into it any addictive potential you might have and start exhibiting degenerate behaviour, which means prioritising porn over more important things.
note that the point here is, that you are only degenerate when you actually let it take control, not when you are in a group where the risk of it taking control is increased. You turn degenerate once you start being addicted, just like you turn rich once you make all the money. You aren't degenerate just because you have an addictive personality, and you aren't rich because just because you have a good business sense.