"Zoo" is not graphic, but rather is a mix of audio interviews-- as two of the three men used in the film preferred not to appear on camera-- and visual re-creations of the events. Director Robinson Devor remarks that he "Aestheticized the sleaze right out of it".
The idea for the film began in 2005 when Devor and the other writer, Charles Mudede were shocked when a story broke of a man dying after having sex with an Arabian stallion. What followed was the revelation that there are internet communities for so-called 'zoophiles' (hence the title of the film, "Zoo").
The film does not focus on any legal aspect of bestiality or animal cruelty aspects, but rather on the psychology of those who partake in beastiality and the combination of man and the natural world.
Devor now says that he considers beastiality to be natural-- "It happens, so it's part of who we are."
I'm trying not to pass any judgement on this.. I certainly think it would be interesting to hear the men who partake in these acts. I also found it odd that the article said the Internet communities were only men.. I hear stories of beastiality involving women all of the time.