"Malazan: The Book of the Fallen" by Steven Erikson has probably got what you need.

The main series is 10 books long, and they are amongst the most violent, brutal, but ultimately very well-written series I've ever (so far) read (still on Book 5).

Books 2 and 3 were too dark for my tastes but I plugged on through and I'm loving it. Great characters, wonderful dialogue, and way less obsessed with Food as GRRM

The First Law trilogy by Joe Abercrombie is a fine example of grimdark high fantasy. It isn't overflowing with sex scenes, but carnal relationships are definitely in play.

Richard k. Morgan’s foray into to fantasy “the steel remains” trilogy might meet that requirement. He’s the guy who wrote the altered carbon books, so it’s basically hard-boiled pulp fiction applied to swords and sorcery fantasy. Similarly Joe Abercrombie’s books operate similarly. Genre is… Grimdark I think.

Steven Erickson’s “Malazan book of the fallen” series also would meet the definition, but watch out—there’s a ton of them, and they can be a bit narratively challenging sometimes.

The Blade Itself

I've been hyping up Dresden Files in damn near every book thread for the last four months, but damn if it doesn't fit here too. There's sex and murder in nearly every one of the books. The murder is very rarely clean, and the stakes are never low. Jim Butcher is one of my very favorite authors now, by a significant margin.

It's not exactly R rated, but Gideon the Ninth (and its sequels) don't shy away from gore and raunchy language.

Lies of Locke Lamora is beautifully written gritty fantasy. Thus far there are 3 books in the series.

I've never read the Warhammer 40K books so I can speak to the quality of writing, but the series definitely matches the genre of interest.

I guess T. Kingfisher’s Saint of Steel series. It may not hit the “fucking brutal” mark but it does cover a lot of dark themes like loss very well for a fantasy, also not afraid to get racy. I enjoy T. Kingfisher as an author so I highly recommend.

Mark Lawrence - Prince of Thorns. Loose fit but it scratches that itch for me anyway. Maybe it will for you too.

NK Jemisen’s the fifth season was amazing. It won a Hugo. Then the sequel was amazing and different and won the Hugo.

Then the last book in the trilogy was crazier and won the Hugo.

Truly wild magic and a very very brutal world.

The Poppy Wars which had an eastern theme.

The Prince of Nothing series which is quite grimdark in a fantasy setting.

The Crimson Empire series is a darkish revenge story.

The Covenant of Steel about a poor boy rising through the ranks.

The Rhenwar Saga involves more magic than the rest.

If you'd be up for modern fantasy you might enjoy Neil Gaiman's Neverwhere, or American Gods.

For high fantasy, Brando Sando has violence aplenty but not sex. I really like the Stormlight Archives.

I also wouldn't write off the Shattered Sea series by Joe Abercrombie. Yes, they're labelled YA but it just makes them easier to binge.

The Black Company by Glenn Cook is pretty dark. It's about a band of mercenaries taking part in a world war where there are basically no good guys. The first book stands well on its own, but it is part of a trilogy.

Might I recommend the Night Angel trilogy by Brent Weeks?

I remember a book series called "something of Krondor" or "Krondor the something" that was really violent and brutal. They made some RPGs based on it too, but I don't think they were ever popular; I have never encountered anyone else who ever read the books or played the games.

Read 'em in highschool and I haven't really thought about it since which is why I can't really remember the complete title or who the author was.

Thomas Covenant the Unbeliever:

https://en.m.wikipedia.org/wiki/The_Chronicles_of_Thomas_Covenant

Cenotaph Road series by Robert E. Vardeman. More sci fi than fantasy, but fantasy adjacent sci-fi.

https://www.goodreads.com/series/74984-cenotaph-road

Another vote for anything Steven Erikson or R Scott Bakker

Lot's of really good recommendations here already. One series I don't see discussed much is the Acts of Caine series by Matthew Stover and I think it's exactly what you're after: shit talking, badass, tortured anti-hero in a deeply depraved and corrupt world with copious violence and sex and a deep and well written story.

Each of the 4 books is self contained but they are worth reading chronologically, starting with Heroes Die. The audio book is also fucking terrific.

https://www.goodreads.com/book/show/311864.Heroes_Die

The Bound Gods series by Rachel Dunne is pretty brutal and bleak. Not a lot of sex but there's baby killing, eye gouging, and enslavement. Zero characters make it unscathed and most simply don't make it. It's quite a ride.

Do you like swords and sorcery? Sounds more like that genre than high fantasy. Not that I'm the genre police.

I mean sounds like you want gore. if you wanted softcore porn piers anthony is the way to go but I can't think of something more brutal than gore. going to be interesting to read replies and see what else is out there.