Sex addiction stems from many sources. In my experience people who have had any type of mental/emotional problems and/or on anti-depressants/have been in the past may experience compulsive behavior. Whether it may be shopping, exercising, or the taboo sex, each are all trying to fill a void inside. This will continue until you seek medical help or just stay single and sleep with whoever you want. But most likely these urges come when in a relationship. It the feeling of euphoria when you know you are doing something you should not do. Once your body gets it the more it wants it.
I personnaly have been diagnosed with a mental disorder and I used to love taboo sex, I also learned its never enough always looking for more. I at this time do not have a buddy to call, but I also have realized my need for treatment. I now am on medications and have no desire to cheat anymore but I sure do LOVE MY TOYS!!
Hope I have helped.