David Duchovny 

When we found out that David Duchovny is entering rehab for a sex addiction, we assumed that he was into good, old fashioned person-to-person sex.

Not so!

Duchovny is addicted to porn.  Internet porn to be exact.  He was doing a lot of surfing and stroking.

XXX Files?!  Ha!  We couldn’t resist.

The source, a friend of Duchovny says he spends countless hours investigating X-rated chat rooms and is now seeking help in rehab for his sex addiction.

The friend was trying to dispel rumors that Duchovny was cheating on wife, actress Tea Leoni. He likened the condition to a gambling or alcohol dependency.

Leoni apparently was aware of her husband’s problem and has been supportive.

She has even cancelled an appearance at the Toronto Film Festival, where her flick “Ghost Town” is to debut, to be by his side.