Well, let's say... it's not simple at all. You need to know some works of Japanese cinematography and paths they leads, 'cause otherwise Anchiporuno will be a big pile of trash with screaming naked girls and messed storyline. Actually it is. But digging deeper expose another level - a brilliant poetic style and very sensual emotion, just like dissonance sonates in early XX's. It's a searching, passion, movement and goal of what's happens in the movie.
Plus naked screaming girls. Don't forget, this is important.
Or just I think so.
I don't think that it has some message, pointing to sexual problems of Japanese society (but if you find it, that's okay, I'm not judging), rather uncertain sense of madness binding by personal disorder. Sexual ego jumping upside down, but in some kind of wild baroque dance.
Awesome.
When you're watching works by Sion Sono you can't just rate it in half-ten stars or seven, or any other way, you either catch his wave or spit on the screen in agony. This one is a perfect Sono- catching.
P.S. Mariko Tsutsui acting is 10/10.