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Duchovny, 48, sprang to fame starring as the conspiracy-minded FBI agent Fox Mulder on Fox network's paranormal thriller "The X-Files," which spawned two big-screen spinoffs, one of which ran in theaters this summer.

He has been married since 1997 to actress Tea Leoni, with whom he has a 9-year-old daughter and a 6-year-old son.

"I have voluntarily entered a facility for the treatment of sex addiction," he said in a statement released through his lawyer, Stanton "Larry" Stein. "I ask for respect and privacy for my wife and children as we deal with this situation as a family."

There were no further details in the statement, which was first reported on the Web site of People magazine, people.com.

In January, he won a Golden Globe Award as best comic actor for playing an oversexed single dad and novelist struggling with writer's block in the Showtime series "Californication."