Pornography is one of the most powerful forms of control, because you cooperate in your own enslavement. Because of the deranging and darkening effect it has on the mind, you become increasingly less aware of what's actually happening to you, less conscious of the self-destruction you are employing against yourself. And because it functions this way, it has also been instrumentalized. Sexual "liberation" is political…
People really do control other people through not just coercion. We can see a modern way of doing this in governments and corporations, currently being called Public Relations.
Consider that control cannot be exercised completely arbitrarily. Most of the time, people who want to control have to use what they have available, so that other people don't resist as much. This means that whatever is there, it will be used for control, but it doesn't mean that the thing exists for the main purpose of control. This is circling back to liberation of all sorts - these don't happen because they want to control us, liberation is happening as a large-scale social change and people who want to control co-opt it for their own purposes. Since it's happening either way, it's an opportunity for them to further their own goals as well.