I'm a fan of pink films of the Roman-Nikkatsu era. Err... that's porn flicks with storylines, themes and sometimes BDSM stemming from '70s and '80s Japan.
Look it up on Wikipedia.
The camera-work is often shoddy, but sometimes is adequate and rarely - just plain fucking awesome. In A Cow Moos in the Dawn or some shit, the decadent sex of a farmer's daughter is juxtaposed with the 'innocent' semi-incest between daughter-in-law and father-in-law using just lighting. Classic natural light vs harsh lighting.
The philosophical jaunt that is The Glamorous Life of Sachiko Hanai focuses less on the sex scenes, but more on dialogue, while the director makes a point about learning and education.
In Beautiful Teacher in Torture, the deconstruction of the ego happens to a kendo queen. While often times mysoginistic and disturbing, the process helps in understanding the many layers of the human ego, as posed by both Jung and Freud. Though to be honest, more Freud. You can even watch it as a reverse Freudian construct.
I also watch Hong Kong's Category III movies - softcore porn - because the Hongkies understand the debased immoral lusts of people more acutely than the unimaginative Americans.
One movie, Robotrix or some shit, is really about the dehumanising of sex and debauchery, to a point where the ultimate sexual experience is found between the legs of a man-made construct rather than the real thing. Which is, in a self-referrential meta, a commentary about porn.
Of course, all of this could have been true, if you also watch these porn movies completely drunk.
