Is it an additiction or do you simply get greater satisfaction from watching porn / masturbating than sex with your partner?
The difference I guess is that do you pass up the opportunity for sex for self release? Do you actively search out porn and prioritise it ahead of other things (work, socialising etc)?
You have at least taken the first step, recognising that there may be a problem.
I'd say that the next step, is a frank and honest discussion with your O.H. It may not be easy, and her reaction may be strong initially but she will most likely appreciate the openness rather than being shut out with lack of intimacy.
After a rather drunken night of passion with my OH, we had an open(ish) conversation about sex and desires, we have now started being more open about what we want, our fantasies and doing things to please the other, I have phrased it elsewhere on the boards here, releasing my "inner pervert".
I think part of my issue was my love for Mrs Sen, I saw how the women were treated in porn, and whilst I know thats not normal sex by any stretch of the imagination, I didn't want to see her in the same light, too much love / respect for her for that, but at that stage, it was an A or B scenario. There are lots more options along the scale from Angel to Harlott, don't be afraid of your OH showing you where she is on the scale. It has been my biggest turn on yet with our play time and her letting go of herself.
I was probably close to being addicted myself, I tend to get very narrow focussed on one thing and stick with it until the next thing comes along, whether thats Porn or spending money on something I "need" like a new TV etc, my mind flips from one thing to the next (case in point, I have spend about $450NZ pesos here on LH in the last month as we delve into sex toys).
I guess, ultimately, communication with her is key. If you can tell her what you want, and find out what she wants, then take it from there.
Sen