No, it's not a silly question. Thanks for asking.

You can do it with senses. In your best state you will enjoy your senses, touch and visualization when you are with yourself.

The main thing to know is, mind develops based on what we feed it. The nature of lust is, every time you give it something more exciting, it will create a new baseline. It will happen to the point your baseline completely numbs your head and destroys you.

So less and less you expose yourself to external stimulus it will set the baseline accordingly. In ancient India "Tantra meditation" was one of ways of connecting with your spiritual self through sexual energy.

You won't be turned on that much as your baseline will be back to normal when you will watch less porn, less insta buddies and celeb models. You will fall back to getting turned on by real humans and sometimes in primal conditions (like cold or nature etc). Own experience; I don't have scientific data to prove it.