OK, the movie has a lot of sex in it, and the characters talk about sex a lot. If that bothers you, I suggest you don't watch it.
But to say the movie is the Mexican equivalent of "American Pie" or "Porky's" is absurd. I'm pretty sure the director's goals were to produce something a bit more artistic than that. And to call the movie "pedophilistic", as one reviewer did! - the boys in question have graduated from high school and appear in fact to be men. And the woman they're travelling with is 29, hardly the pathetic older woman of one review. Plus it is Mexico, not Spain.
The movie is set in Mexico and is a meditation about and/or indictment of the huge class disparities of the country, and an examination of how Mexico is modernizing. It's about sex, too, of course - I got out of it that behind the macho posturing of many men, there is a yearning for closeness and connection with other men, which they cannot acknowledge. Except sometimes, when they're drunk, for example, as in the scene in this movie that so bothered some reviewers.
The movie is well-made, the dialogue is interesting - the characters actually talk, not just give enough info to move the plot along, as in so many action films - the acting is excellent, and you get to see a lot of Mexico, both the city and the country, the rich, the poor, and the middle-class.
On the technical side, the DVD transfer seems fine.