Playing catch up:
There used to be a market for porn aimed at men, and adult bookstores were full of it. Historically, there was a substantial amount of Victorian porn, with titles like "A Man with a Maid". See also works by the Marquis de Sade (whose name gave us the classification of "sadism"), like "Justine", "Juliette", and "Philosophy in the Bedroom." IIRC, they were composed while de Sade was in an insane asylum. And along that line, we have Leopold von Sacher-Masoch and "Venus in Furs", which got us the classification of "masochism".
For literary stuff, you had Maurice Girodias and Olympia Press in the 40s and 50s. David Moynihan, the proprietor of Blackmask.com (later rebranded as Munsys.com) was reissuing Olympia Press titles as eBooks. He seems to have disappeared, and I have no idea what happened to him.
Other publishers included Midwood Books and Masquerade Press, and California porn houses Brandon House and Essex House. A number of SF/F writers turned their hand to porn. The late Andy Offut write SF/F, but most of his output was porn. Dean Koontz wrote an assortment in his early days. His wife Gerda would do a first draft over the week, he'd do a submission draft over the weekend, they'd send it off, and get $650 a book. In the late 60's, that went a long way to keeping food on the table while Dean worked on serious books. Most were under pseudonyms, but a few he signed his real name to. My copy of Bounce Girl went walk about a long time ago. It was autographed, and I can only imagine what it might fetch on eBay.) Marion Zimmer Bradley commented she'd have no objection to writing porn if she could figure out a way to make it
pay well enough. John Norman's Gor series started out as science fantasy, but soon turned into SF BDSM, with a female slavery motif. (
viewtopic.php?f=1340&t=1613863&hilit=gor)
Anais Nin did some porn volumes, like Little Birds and Delta of Venus. They were collections of stories written for a wealthy patron The patron wanted only action. The results read like outlines for the stories Nin
wanted to write, with things like meaningful characters and plausible motivation. I wish I could have read those stories. (Little Birds' links are dead. Delta of Venus is available on Mobilism among other Nin works. See
viewtopic.php?f=1340&t=220159&hilit=Anais+Nin)
Nin was Henry Miller's lover at one point, and appears as Mara (later Mona) in his Rosy Crucifixion trilogy, Sexus, Nexus, and Plexus. (
viewtopic.php?f=121&t=1342806&hilit=henry+miller)
What changed was the spread of video, especially when it became available online. Porn rebranded as erotica, and the audience was female. My basic comment is "Men
watch porn. Women
read it."
I'd actually rather read it and exercise my imagination. Most porn video leaves me cold. And while there are a couple of dead links to some of Alexander Trocchi's work here - "Cain's Book" and "Helen and Desire", I wish someone would post his White Thighs,