The main characters are all flawed, if not deeply disturbed.
The iconic shower scene never shows the knife touching flesh, but there is blood, and the character's dead face and eyes are shown up close. There are also several very frightening scenes involving a corpse. A man is stabbed, with slash marks across his face.
A couple is shown post-sex, though they are clothed. A man spies on a woman as she removes her blouse, revealing her bra. Nudity in shower scene but nothing sensitive shown.
Drinking, Drugs & Smoking
Some drinking, but no one acts drunk. Cigarette smoking. A secretary makes reference to taking tranquilizers to help her with her headaches.