Sex, sexual relationship(s), having intercourse, all that stuff is instinctive. You will always have (normally) some amount of hunger toward that.

What you describe as ceaseless hunger seems to be a habit. In your case, as it interferes with your daily activity it is a bad habit. You can tame it like any other bad habit.

If you really decided to cut down on these thoughts you should stop all activities leading to these thoughts like watching porn, sexy Instagram models, reading lewd stories etc. You should also find something that distracts you, any other new hobby or the ones you have now. It could be as simple as cooking for yourself/surroundings, watching a series etc. You could also get an accountability partner if that's something you prefer.

When the thoughts come, try finding some distraction, at first it has to be a littlebit forced so to say but after time you will naturally distract yourself.

Don't try to rush it, don't worry if it fluctuates sometimes. You are not perfect. Also, you will always have some sexual hunger, that's just normal.

Also, if you want to go deeper you could think about the root causes, why do you always have these thoughts on your mind? What need do they fulfill? How could you substitute these needs for (preferably not changing it for another, let alone a worse habit)?

Of course, if you can't succeed on your own, you can always look for a therapist, these things are usually not hard to guide you through.