Just to relate to my previous post above, and to, relate it to a peer-reviewed study, I offer the following for pondering, not to backup my thesis, but as a point of discussion:
http://www.tandfonline.com/doi/full/10.1080/10720162.2013.768126#
Now, the base theory of this article anticipates that "porn addiction" isn't an impulse control issue, but rather a subset of hyper-sexuality disorder, ie - a disorder related to nymphomania. And here's the criteria by which they make that diagnosis:
(Click link above and click on: TABLE 1 Proposed Diagnostic Criteria for Hypersexual Disorder)
Personally, from a 100% non-professional opinion, I'd imagine that such a problem could stem from any one of a multitude of underlying issues similiar to say - anorexia. Anorexia syndrome labels the manifestation of the disease, its symptoms, and how it presents itself. However- it is still recognizes that the underlying issue that is causing the disorder could stem from any number of biological or environmental factors. And thus the drive to not only deal with the symptoms (the manifestations of the syndrome) but also the root cause.
As such, I can agree that some mindsets (like the study I cite) are off-queue when addressing the "porn addiction" issue. If they presume that the cause is always sexual in nature, they are ignoring other factors that might be in play. Like a biological issue (seratonin issue?) or an environmental one (that it's become someone's stress release and they need a wider knowledge of coping techniques.)
So, at base, as noted in my other post, I don't disagree with the idea that within certain criteria this is a syndrome that might need labeling for treatment purposes, but - I do agree that it needs to be properly handled. That the social stigma and discomfort with the topic shouldn't influence the treatment of the problem, as - that's a bit too akin to how all female sexual problems were lumped into "hysteria" without careful consideration.
Edit: Didn't realize my links were user specific, fixed now!