What you do in private is not my business basically. But when you meet someone, you need less of that stuff lets say.
I've heard that argument too... some will say, "If I only had a girlfriend/woman in my life/wife (or man if you're a woman, of course), I wouldn't need that stuff."
But from what I've seen, the problem gets worse instead of better, because the person who's been absorbed in porn will generally want to "try out" what they've seen... leading to a lot of bitter feelings if the other partner isn't interested. So then the person will say, "Well, if only my partner were more open-minded, experimental, willing to try this or that..." and they wind up trying to find someone else, because they will say, "You aren't meeting my 'needs' and I need someone who will'."
I think this is one of the general deceptions of porn--people think they need someone, and that they'd be able to quit if they had "the right person". But what it really does is set you up to never be happy with anyone, no matter how "perfect" they might seem at first.
I've also had guys say, "You don't understand, I'm thinking of you when I'm looking at X and doing..." (whatever), to which I reply, "Oh, then I'm supposed to be flattered that you think of me as your own personal porn object?" Sorry, just not my idea of a compliment as a Christian.
This could just be me, but I personally don't see how anyone who is filling their mind, heart, and soul with these images can realistically expect to be able to treat a member of the opposite gender with genuine respect and dignity--because the images will be playing, replaying, and morphing in their minds as they spend time with you, no matter how skilled they think they are at "compartmentalizing" the images.
Feel free to voice another opinion if your experience has been different.