Zac Efron's got some stamina!
The actor just got extremely candid about his masturbatory practices in a new interview with James Franco -- revealing he sometimes does it 17 times in a single day.
While the two get into graphic detail about "driving stick shift" in the video above, Zac even shows off his O-face.
But before you get all confused ... or possibly excited ... we're sad to report the clip is actually part of Franco's new flick, "The Interview."
James plays talk show host Dave Skylark in the film and the 1:1 above is actually a clip from his faux show, "Skylark Tonight."
In the flick, Franco and Seth Rogen's characters are recruited by the CIA to help assassinate Kim Jong-un. It hits theaters Christmas Day.
Is this the kind of raunchy entertainment you'll be checking out this holiday season? Count us in!
