Share porn with him. He’ll prefer video, but you’ll have a better chance of finding something exactly right if you look for a story or essay. Show him something that will make you feel exposed, that evokes your motivations and needs from someone else’s mind.
But make sure he knows it’s more than porn. More real. More thoughtful. And that you’ll understand if there’s a line he isn’t comfortable crossing, that you’ll never think less of him for respecting you too much.