In the time that I've been posting (mostly erotic) fiction on various sites (AFF, Hentai Foundry, and Inkbunny), my experience with male and female readers has been, to me, extremely counterintuitive:
--I've written several stories that, at the time I wrote them, I considered "woman-friendly." That is, the female characters have strong roles and are equal partners in sexual activity. Female readers never review these.
--Of the first dozen stories I posted on AFF, the only one that any openly female reader (ie, a reader whose username or profile makes her gender obvious) has reviewed was one in which the female protagonist is repeatedly gang-raped. Her comment was "Very good fic."
--Only male readers express dislike for my non-con stories. A male reader who reviewed one such story yesterday told me that it was well written but made him want to vomit.
--In contrast, the only stories I've written on which women seem interested enough to comment (always positively) are stories that involve rape, incest, or both.
Now, I generally don't talk to my female friends about their tastes in erotica, so my only RL source of info about what women want to read is my wife. So when I think "woman-friendly," I'm thinking "something that won't make my wife smash the computer screen and run away screaming." But then, I can't imagine my wife visiting AFF, so maybe she's not a good representative of what women who like erotic fiction enjoy.
Anyway, I've blathered long enough. I'd love to hear what other AFF users--male and female--have to say on this subject.