Because no women are stupid and barbaric enough to actually enjoy, let alone produce, garbage like plotless sex-only works. If you do, you can't even be considered a woman at all.
I mean, I understand that women aren't usually into stuff like this, but there are some out there, and to say they shouldn't be considered a woman is pretty harsh. Yes, most women usually prefer romance, and if they do like smut, they usually like it on the side with the romance, but there are also some who like raw porn, and even extreme things like this. Personally I stopped reading once that older girl slapped the younger girl when she told her to stop.
For people who actually claim this (who I know in real life): you obviously haven't read any fanfiction. You would not imagine the amount of rape and other horrible shit that female writers come up with.
At the same time, I do think that overall female readers appreciate more story along with their smut (at least I do). That's not to disparage the existence of porn without plot - I definitely appreciated it a lot more when I was younger.
Anyways I didn't really like this.
Yeah exactly, there are tons of fanfiction writers that write crazy stuff like that. I mean 50 shades was written by a woman, and I was told it was a terrible story/movie (never read/saw it) Though a good majority of females probably don't write about yuri. I bet you'd see more crazy stuff like this in the yaoi/hetro section written by female writters than the Yuri section.