Watched Y Tu Mama Tambene a few nights ago in Berlin. A very explicit but awesome film.
Really? Even without it basically being soft-core porn I didn't find much worth watching in that flick. And that was when I was pagan.
"Girl has cancer. Girl has sex with young men to cope with it. Couple nice shots with the camera. End."
If you like Cuaron, watch Children of Men.
I found it via Children of Men, actually. Someone recommended that if I wanted to see another example of that sort of the cinematography, check out Y Tu Mama Tambene. The constant contrasts between the storyline and the political/cultural backdrop of Mexico were cool.
I also thought it was a good study of the futile repetitiveness of human fallenness. Perhaps I looked at it with a different perspective than you did. I was watching the film with a girl who kept saying, 'what!? As if he'd do that! He has a girlfriend in Italy!' and I kept thinking, 'um, wake up, people are sh**.'
EDIT: btw, Children of Men is one of my favourite films. I could watch the single-shot refugee camp scene over and over again for days.