Well this movie is one of my all time fav. Even if it is incest at some level, you never really feel it through out this visually beautiful movie, neither the dirt nor the shame. It all mellows out in comparison to these two step-brothers love. Yes the last third is a half baked formula movie plot yet it does show some growth on the characters' part. So, I will pardon it.
Homosexuality and Latin american society is perhaps one of the most self contradictory convoluted example social dichotomy. There are many movies that shed copious illumination on the matter. Few of the more visually interesting ones include Contracoriente http://www.imdb.com/title/tt1368491/ and El Cuarto De Leo http://www.imdb.com/title/tt1508955/