The overall tone is pretty dark, with a sense that there's something sinister lurking beneath the surface. The Bates' dysfunctional mother-son relationship is another major theme, with an emphasis on keeping family secrets.
Violent scenes include stabbings, rape, torture, etc. Blood is visible but not gratuitous.
Some sexual tension between teens. Some bare skin during rape, but no sensitive parts visible.
Mostly terms like "hell," "bitch," "ass," etc.
Some teens drink underage at parties and use illegal drugs like pot.