I have a hard time believing there is such a thing. I'd agree with compulsions as also showing up in sexual behavior but addiction no. Things like sex, food, ect....all can impact one's life negatively if abused, but sex, food, and other similar things don't impact the brain chemistry in the same way that drugs like meth, coke, alcohol do (if memory serves). Real addiction rewires the brain, temporal medial forbrain i think....My biggest issue with sx addiction is that it's partially a get out of jail free card for ones choices in our culture, was developed by addictionologiests rather than sex therapists, and is quite shaming.
If I were addicted to food, learned how to control my eating habits and improved my body image, would I always have to call my self anorexic? Sex is just so much more multifaceted and complex ..that to call it an addiction, to me, does more harm than good.....and is a way to make money around behaviors that are, for the most part, fairly common in our society and don't lead to impairment in daily functioning.
Hope I'm not offending anyone. I just get feisty with this as people seem to be calling themselves sex addicts all the time now, and it's not even a definition in the DSM (not that the dsm is all that great).