Quit those dirty thoughts you perv! Early in her career, Mirren had a rather prominent role in Caligula, a movie now infamous for its extreme violence and graphic, un-simulated sex scenes that critics reviled for being a sad attempt to shock the masses.
He just wants Mirren to pose nude for him so he can truly create great art.
Wait, how is this trifle of a movie from the same guy that gave us the brilliant The Red Shoes and Black Narcissus? She also starred as Victoria Winslow in the action-comedy films Red and Red 2.