I don't necessarily agree with this definition of addiction. I believe that a person can be addicted to a substance or a behavior without suffering very many, if any, adverse consequences.
I believe more in the very elementary definition of addiction, which is to say that I believe in the word's actual meaning, to devote one's way of life to someone or something. If a substance or a behavior permeates your every waking thought, and if a substance or a behavior tends to come before all else, then you are addicted to that substance or that behavior. In this way, "sex addiction" is a very real thing.
I like you, Ksa, and I like reading your posts; they really make me think, and I mean that sincerely -- no sarcasm. I happen to disagree with you, but I still enjoy reading your posts nonetheless.
I happen to believe that we are a confused species, a species that wants to be monogamous but is always sort of looking around for something else. Interestingly enough, they've found that mammals with larger-sized testicles tend to mate with many different partners, but mammals with smaller-sized testicles tend to be monogamous; human men have average-sized testicles, which could help to explain our monogamous intentions but polygamous behavior. There have been a lot of different studies on this, actually. I haven't looked too much into it, but what I've read is real interesting stuff.