It's not about the orgasm. It's about sexual content, be it lewd or nudity, that releases dopamine in my monke brain that wants me to engage in sexual acts and procreate.
Cooming works only as a relief of that sexual tension and usually brings clearer mind. If I coom without any visual aspect of sexual content, the horny comes back the same day.
And yes, I'm pretty positive that it's addiction. I have a very high libido as well, so I was fucking with my ex pretty much every time I saw her and I needed less other things then.
Those things considered, I think it's sexual content or wanting to procreate addiction. I want to get rid of it, because it stops me from becoming the person I want to be, and having so much brain filled with sexuality gives me thoughts that go against my philosophy and world views.
I see that I used many verbs that distance this addiction from myself, but I think I consider myself responsible for acts of engaging and I feel annoyed and guilty every time after finishing.