The movie is about telling the truth to lead a more fulfilling life, even though lies are more protective. In a subplot, the movie celebrates fighting for what you believe is right, rather than following long-established rules that may be wrong. On the downside, "wrongdoers" are often killed.
Lots of bloody vampire violence. Here, vampires slice their victims not with fangs, but with a sharp fingernail that grows when needed. There's a great deal of blood, lots of killing, and several dead bodies (including charred and rotted corpses). Two characters are beheaded with a wire. One character -- who takes an anti-coagulant -- gets a cut on his wrist and bleeds profusely. There are also some intense moments of fighting and punching, as well as arguing. In one sequence, several waterfalls turn blood-red (though it looks more like colored water than blood).
Several of the supporting characters are prostitutes, and the main character is shown to have been one previously. No nudity, but characters wear revealing clothing throughout, such as lingerie and fishnets. Partly naked bottoms and lots of cleavage are on display. Sex acts -- a lap dance, oral sex, etc. -- are begun and/or suggested but not fully shown. Some strong sexual innuendo.
Language isn't constant but does include a few uses of strong words including "f--k," "c--t," "s--t," "c--k," and "bitch."
Drinking, Drugs & Smoking
It's suggested that some of the supporting prostitute characters are "high" or on drugs, though they're never shown taking anything, and nothing is ever mentioned out loud. They just act sleepy and dopey.