Sex Addiction? Not everyone considers "sex addiction" a useful diagnosis, in the first place. Read Dr. Marty Klein's thoughtful perspective on it: http://www. Martyklein. Com/why-sexual-addiction-is-not-a-useful-diagnosis-and-why-it-matters/ Suggest consulting w/ a sex-positive therapist to understand concerns you may have about yourself (or other person) in relation to compulsive sexual behavior.
Mutual support helps. Treatment may or may not work depending on whether the addict is able to surrender to getting help. Mutual support always helps, since the addict has the opportunity to witness other addicts surrendering to getting help.