EXCLUSIVE

Buff Bagwell in the Buff ... is what we think Vivid will title what could be his first XXX flick.

Buff -- who starred on "Gigolos" -- caught the eye of Vivid honcho Steve Hirsch, who calls a BB film an "absolute blockbuster."

Hirsch and Buff met recently to hammer out a deal ... and there was a third person in the room -- Buff's wife, Judy.

Judy has got to be the envy of every wild husband in America. In addition to flirting with porn, Buff has intimated he has sex with the women for whom he gigolos. And she's cool with that, too.