Erotica != porn...
What is the difference between erotica and porn?
I am no expert, however, the former requires and stimulates the imagination, whereas the latter doesn't do that, everything is shown and nothing is left to the imagination.
From my experience of the 'stumbleupon' (a link-sharing site from many years ago), I would describe the saucy pictures women collected/liked as erotica rather than porn. Clearly porn would not make it to Stumbleupon, however, erotica tended to be collected by women rather than men.
This is just anecdotal observation from a few years ago.
Fundamentally, Western culture objectifies women (for profit) whereas other cultures don't necessarily do that, to consider porn as degenerate.
There is also local culture. Compare the boy that has strong women in their life and attends a mixed school with the boy that has older brothers but no sisters, goes to all-boys schools and is exposed to 'DJT locker room talk' (that would not never wash at the mixed school). The former is going to find porn to be cringeful and boring, whereas the latter gets hooked, particularly if they have a weak father figure that is into porn.
In the USA there is an incredible amount of sex and violence in the media. Just because it is all around, American women are going to be 'ambient' consumers of porn, with partners that think that watching porn with their partners is okay. I am not disputing your 'third of consumers' statistic, however, there are parts of the world where women have some 'immunity' to it.
As an aside, we all have our price and I did do some work for Playboy many aeons ago. I thought this would be a career limiting move, however, the Playboy people behind the camera were all women, extremely intelligent and a joy to work with. We didn't have full nudity, with the women in front of the camera being down to earth, friendly and not what I had 'feared'.
Playboy also had the articles, some of which would not be touched by the mainstream media, enabling Playboy to be a platform for whistleblowers, whilst giving some 'plausible deniability' for readers.