Season 1: Some sexual references/humor; fairly infrequent

In the third season, there is an orgy throughout an entire episode. Sensual position, clothing, and moaning are present.

Season 2: Sexual humor/references are more infrequent

Season 3: Sexual content, humor, and references are notably more frequent and somewhat more explicit

Stronger every season. Since season 4 premiers later as I post it, I'll update this accordingly if season 4 turns out to be more or less sexual then season 3.

Fairly mild violence, with most deaths taking place offscreen, some with blood splattering onto other characters

Language is fairly mild, with occasional stronger language, such as "sh-t" or "a--hole"; uses of any stronger language are bleeped

In season 3, there is a scene where caulk is used as a euphemism.

Some references to drugs, but no onscreen use

Some characters consume alcohol, some occasionally shown drunk or appearing to be drunk

Natural disasters, violent invasions, executions, and rampant criminal activity are featured, but are mostly played for comedy