Other people more learned on feminism have written detailed esaays on the subject, which I can dig up when I get home if you'd like (on my phone now), but it boils down to the books basically being a feminist deconstruction of Fantasy tropes with an emphasis on the ways women were mistreated in medieval times and the way that treatment cam effect their thinking (see Catelyn and her patriarchy brain), while at the same time having a spectrum of female characters in varying social positions and degrees of internalized misogyny (Cersei is the Queen of internalized misogyny).
When sexual assault happens in the books it is always within that framework and is even willing to show men being sexually assaulted, and appropriately, because their society does not allow them to realize it, not even recognizing that they have been sexually assaulted despite still being traumatized (see Tyrion/Tysha in the barracks and Theon/Jeyne Poole - the assailants in these cases being Tywin and Ramsay respectively). Compare the show's use of sexual assault for shock value or in the case of Margaery's sexual abuse of Tommen (yes, an adult woman sleeping with a 12 year old boy is sexual abuse) being played for laughs.
Compare Sansa's entire arc being derailed so she could be a setpiece for Theon's abuse.
Compare Arianne's complete disappearance and the utter disdain for Dorne in general. More sexually liberated becomes bad pussy.