Occasional sex scenes, mostly they don't involve any nudity. There is a naked corpse in one episode, in episode 4 the actresses breasts are seen.

First episode

Frequent violence including hangings, stabbings, shots the head, and more. There is some more cartoon like/classic japanese action sequences, but interspersed with countless deaths in a variety of gory manners

Fairly regular cursing as fits the manner of the show and the time it is set in

Most characters are drinking for what seems like the bulk of the show. There is also drug use, including hard narcotics being injected (injection not shown)

The whole show is certainly R rated and not for the squeamish or faint at heart. It fits with most gritty westerns with scenes of hanging, and graphic deaths.