Duchovny: Sex Addict Onscreen and Off

For an actor who is a sex addict, playing a sex-starved character is not only a great cover, but it could also have triggered some off-camera acting out.

"It's highly stimulating," Marshall said. "Maybe when in he was in the 'X-Files' he was able to hold himself back. Now on this show he has permission to act in sexualized manner and the addiction got out of hand."

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Not every sex addict thinks they have problem, and many only seek treatment after their addiction disrupts their lives. Marshall believes that's what happened in Duchovny's case.

"Where there's smoke, there's fire," she said. "Most addicts do not enter treatment until their addiction causes serious personal and professional distress and they are confronted with the reality of their predicament by the people around them."

Once treated, Duchovny may have to think twice about returning to his role as Moody. After all, it can't be good for a sex addict to be around all those young virile actresses while kissing and pretending to have sex with them.

Said Marshall: "He may have to choose between his job and his mental health."