Quad Graphics in Sussex, WI (414) 566-6000
They outsource from Brazil, Argentina, Canada & Poland.
I believe their Montreal location prints the nude content. They are Playboy's publisher, or were last I heard.
Quad Montréal & Solisco
147 Saint-Paul Street West, Office 120
Montreal, Ontario H2Y 1Z5
514-289-9191
Another adult printer is Transcontinental
TC Transcontinental Printing
100 B Royal Group Crescent
Vaughan, Ontario L4H 1X9
905-663-0050
Then there's always this list of
adult magazine publishing companies 