It's a fantastically directed, rather average movie. Acting is poor (by the two leads, anyway), and the plot is a bit lethargic. Like said, visually lush. I haven't seen it in a while though, perhaps I'll make a point of doing so again and see how it goes.
Out of everyone who's contributed their convoluted, ridiculous analyses, nobody has actually made a conclusion. That is, everyone mentions that the film depicts, heavily so, sex, morality, and perhaps, the dynamic of human interaction, but can't actually define the "why", or what their interpretation is.