Sure, I definitely believe in sexual addiction, just as I believe in many other addictions. And, those with these addictions certainly can find serving Jehovah a struggle at times (don't we all?). Jehovah WILL help all who want to serve him, no addiction too powerful !
I do believe, however, that many use the term "addiction" as an excuse for bad behavior. Many live a lifestyle that to them is exciting, empowering, or otherwise psychologically beneficial, and makes then feel good(like lots of sex, its like a drug high). When caught or questioned they claim addiction, when really it was just a life style choice. I know my use of the phrase "drug high" is going to make some point and say "see, it is an addiction". But the fact is that most could change in a instant if they wanted to, so its just bad behavior on their part.
Again, yes, I very much believe in sexual addiction. But, I think, to make a guesstimate, maybe one person in ten who claims to be a sex addict really is a sex addict.