Both cops and criminals lie and abuse one another as a matter of course; men's bonding and competing are similarly violent.
Explicit, bloody, frequent violence: shooting (blood sprayed on surfaces), stabbing, head-bashing, shoot-out, suicide, car crash, kicking, exploding; a body thrown off a roof bleeds on impact; cops joke about bloody corpse/crime scenes and photos; a thug pounds on Billy's broken arm to ensure that there's no listening device in the cast; Frank fiddles with a bloody hand in a plastic bag while discussing plans; crooks burn down their hideout to avoid discovery; Billy worries about his coolness while working with a "mass murderer."
A couple of sex scenes show nudity (bodies in bed); Frank's girlfriend appears in underwear and they share sexual banter; recurrent sexual slang ("d--k," "c-nt," "screw," "whore," etc.); scene in porn theater includes brief shots of nude bodies and moaning sounds; Frank accuses priests of sexual abuse (using explicit language, like "p--ker"); Madolyn alludes to Colin's inabilty to perform sexually ("Do you want to talk about last night?"); Frank harasses teenager by asking if she's "started [her] period yet."
Frequent use of "f--k" (200+ instances); derogatory uses of "queen," "homo," "guinea," "mick" other profanity ("douchebag," "ass," "s--t," "hell," etc.).
Background imagery in bars (for example, Coca Cola or beer logos).
Frequent cigarette-smoking; drinking in bars (sometimes leading to drunkenness); Billy asks for Valium, then takes prescription anti-depressants repeatedly.