Skeppers I've tried a Brett Easton Ellis but gave up halfway through chapter one as it was too much for me.
I have read, and re-read the whole of ASOIAF many times. I'm gonna say probably 10 times so far. The Theon/Reek chapters are awful to read(especially Ramsay's wedding, which I am hoping like hell doesn't make its way into the show) but the reason they're so awful is that GRRM is very good at depicting the mental response to physical abuse. The physical torture that Reek has endured is agonising, but the way his spirit has been broken comes across as the worst of it.
There is one part of the whole series that I can't bear to read and it's in one of Arya's Harrenhal chapters in ACoK. When the Mountain and some of his men are laughing about a woman they just brutally gang-raped. Again, the reason it's so disturbing is that GRRM has written the conversation in a way that comes across as true and realistic - these are evil, brutal men, but they are not depicted as cartoonish villains, which makes them far scarier.
One thing that is notable for me is that GRRM as a writer really understands his characters, whether they are women or men... or a wolf.
He also comments a lot on the unequal status of men and women frequently throughout the books. Catelyn and Brienne spend a lot of internal dialogue thinking about their lack of power and their vulnerability compared to men. Cersei rarely goes a chapter without cursing the fate of being born a woman and how men are all dumb assholes who can be controlled with sex. While, of course, stabbing every woman around her in the back.
The show is a different beast from the books and yes there's a large amount of male gaze-y nudity although they do seem to have made an effort to even it out. We've seen Hodor and Theon full frontal and we've had lingering backside shots of Daario (twice) and Jamie. Certainly there is more female nudity and yes this is a marketing measure, of course it is. Some nudity is in context but some is there to draw in viewers. It doesn't stop me watching. (Jamie's character assassination, on the other hand...)