'Gigolos' Star Nick Hawk -- Naked Photo Shoot ... with a Penis Pump

What does "Gigolos" star Nick Hawk have in common with Austin Powers?? They both have a special affinity for penis pumps, baby ... YEAH!

Hawk -- an original cast member on the Showtime series who also happens to be a real-life male escort -- broke out the dong-enhancement device for his recent full-frontal photo shoot for Playgirl ... and TMZ has the pics.

No word if Hawk's penis pump is of the Swedish variety ... unlike some other people we know.