The second prong of the Test establishes that the obscene material must depict or describe sexual content as defined by the appropriate state law.
And thirdly it establishes that the material must be taken as a whole, and whether the material has relevant redeeming factor such as artistic, political or scientific value. The third prong is interesting as it is a check on the second prong, as it makes sure that the state law isn't overly stringent.
Prong three is where the test becomes revolutionary.
The Miller Test, as it is stated, makes it easy enough for the adult film industry to tailor their material to fit the test. Films and naughty magazines simply need to mascaraed as art. I think the pizza delivery man's penis was a metaphor for the internal conflict of modern social conditions and between the internal, animalistic drives of a rugged individualist with lube.
I posted the following video to YouTube which goes further into the circumstances of Miller v. California. It's perhaps a bit cheeky and the production quality isn't the greatest, but I recommend watching it if you are still interested in the matter.
Click here for Part I, Part II, Part III, Part IV, Part V