You are basing your view of what porn women watch on data from an anonymised website. I'm a bloke and when confronted by a box asking what 'gender' I am I almost always click female just 'cos I can. Seriously I'd love to see their methodology because I rather suspect it wouldn't stand the slightest scrutiny.
I remember this study. It was discussed previously on here and I read several linked articles.
It was conducted with Google Analytics which has been tested against more traditional methods and been proven to be accurate in analysing large data sets - businesses use it for their marketing analysis.
Everybody who uses Google products (Google web browser, Gmail, etc) must necessarily agree to Google's terms of service, which allows them to track your internet usage and browsing history - through the use of a cookie which downloads to your computer I believe.
The user analysis can look at such things as the browser searches you make, the websites you access, and the channels you subscribe to (e.g. on YouTube). It can also access your sign up details (name/DOB used when creating your account). Generally, this data has been proven to yield accurate results. If somebody signs up with the name 'Sarah', subscribes to Zoella's channel on YouTube, and mainly watches channels/accesses sites about women's fashion and feminism, she's likely to be female.
Similarly, if somebody signs up with the name 'Dave', indicates they're male, subscribes to MMA channels on YouTube, and regularly searches things like 'Arsenal vs Chelsea score', they're probably male. Across millions of users (which Pornhub has) this data can build a very accurate picture - it's been proven by studies.
I don't think the point here is about women being violent, it's challenging the statement that 'there is a whole multi billion pound industry based on men’s wish to see women hurt and degraded'.
If the most violent porn is viewed overwhelming by women, then they are supporting this industry and partly responsible for it's continuation as it wouldn't be produced without any audience to cater for. Of course, men are still by far the principle demographic, and all porn is degrading to women. But it is certainly a bit alarming that women are prime consumers for the most violent type and I don't think this fact should be ignored.