Here's what I responded to other user about this:

Porn and masturbation feel good. It’s the physical stimulation I’m addicted to - porn just amplifies it. You can even take it further with porn, drugs, and masturbation combined. It’s not about having an itch that I’m trying to get rid of; it’s about the sensation of scratching it that I crave. I start watching porn and masturbating first, and only then does the feeling of “horniness” follow. The idea of walking around with that itch - without having first triggered it through stimulation - is completely foreign to me. And honestly, I don’t need anyone else to scratch it for me - I’m better at it myself.

Here's the full exhange incase you're interested