Fashion retailers Johnston & Murphy are hiding all evidence that David Duchovny endorses their product, because he was too busy having sexy time to keep their clothes on.

David's XXX files became public knowledge when he checked into rehab this week for sex addiction -- and a store clerk at the J&M store on Madison Avenue told the NYPost Duchovny's poster was removed because "We got the call from corporate this morning to take him down."

Guess there is such a thing as bad publicity.