PG 16 would apply as child prostitution is implied.

Prostitution is mentioned and implied multiple times.

There is some nudity, mind you it is VERY mild and mainly involves side-breast views and views of characters butts.

There is a bit more vulgar sex scenes involving thrusting, etc.

Very violent. Characters are shot, with clearly visible blood explosions.

In almost every episode, the word 'nigger' and/or 'negro' is used and in a derogatory way.

Frequent use of Shit, Asshole and and similar but nothing stronger. (More-so in season 2)

Some religious exclamations used, such as 'Jesus' & 'Christ'

Characters frequently drink and smoke cigarettes and cigars.

The overall tone is very grim and sometimes upsetting.