What is Clint Eastwoods high plains drifter rated r for?

"High Plains Drifter," directed by Clint Eastwood, is rated R primarily for its strong violence, including graphic depictions of gunfights and brutal confrontations. The film also contains mature themes, such as revenge and moral ambiguity, along with instances of profanity and sexual content. These elements contribute to its overall gritty and intense atmosphere, characteristic of Eastwood's westerns.