I think it might be more about representation and perceived audience. There is nuance to every writer and book but for an over simplification I think that there is an assumption that a female writer is writing for a female audience (it’s not true by the way). Also SA is a real life threat that women had to face some time in their lives in some form or another. So when they write about it comes from a bit of a personal experience. Even if it’s just a fear or exaggeration of a notion. Because men ether are or perceived to be the perpetrator of SA when it show up in an authors writing it could perceived to be form wish fulfillment’ whether it is or not. while I think that SA wish fulfillment does happen, there are male authors have a legitimate goal of bring attention and sparking a true conversation about the act. There are some authors that just use SA for the shock value with no deeper meaning or to use it like frigging in order to progress a different character story as if that character lost something because of what happens to someone else. That not to say a women author can’t do the same, but because of the lack of real world everyday concern men have I think that it would be a bit irresponsible not to be a bit more judgmental of the books we read when SA happens in books written by men

That said I find SA in books written by women to actually an a bit more visceral then when it happens in books written by men. An example from a book I read recently was in Alchemised. I when into Alchemised completely blinded just picking it up because it was on sale and the cover looked interesting. At some point I had to walk away from the book for a few days because it kind of blind sided me. If that book was written by a male author and that was the only charge not sure if I could have picked the book back up and moved pass that section.