Re: Is my husband a sex addict?
From your description in your original post, I would say that your husband probably does have a sexual addiction. This is a broad term that can be used to encompass an addiction to pornography, masturbation, strip clubs, etc. Generally, when the unwanted sexual behavior interferes with work, relationships, etc., an addiction exists.
Your husband is probably telling the truth that he wants to change his behavior, but willpower is not always enough in and of itself. If an individual has a true sexual addiction, there is a lot of change that has occurred within their brain chemistry that can make it difficult to give up. That does not mean your husband does not want to give up the addiction. It also does not mean that he won't be able to stay "clean" for extended periods of time. More than willpower is needed to rewire that brain chemistry though.
You can do research online into sexual addictions and it can explain a lot of what is going on. One site that my husband (who is recovering from his own pornography/masturbation addiction) found to be particularly helpful is Candeo (you can do a google search). It is a site that provides a lot of training, information, insight, etc. into sexual addictions and how to overcome them. It also provides training for the partner or spouse who has been effected. I found the spouse training to be incredibly helpful to me, as you also have to go through your own recovery, due to issues of trust, betrayal, and insecurities that often occur.
There is no quick or easy solution, but with open communication and dedication to change, things can get better and your relationship can be stronger for it.