Causes can of course be more complex, while for some - a fast-growing number, according to Hall - it's simply opportunity-induced."The reality of the Western world today means you can find anything you desire easily and anonymously."So when he sat me down one day to tell me he was a sex addict, I actually laughed - although I soon stopped when he disclosed night upon night of watching pornography for hours on end and numerous short-lived affairs.
Like most partners, she initially didn't buy into the concept of sex addiction ("it sounded like a pretty weak excuse for an affair") and even when she did start to believe that her husband's behaviour was compulsive, her friends didn't ("they'd look at me in despair, asking since when had sexual desire became a monster that can't be controlled"), leaving her feeling isolated.
To be fair on Rachel's friends, there is some debate about whether the term sex addiction is scientifically accurate, but the field of addiction is changing fast and emphasis is shifting from the substance to the psychological symptoms of addiction.