FWIW, anyone who hasn't read recent commercially published erotic fiction should give it a try. While some of the stories available for free online are good, more are... not. Writing well is a learned skill, and many people who want to share their stories haven't yet mastered it.
The same is true of self-published erotic fiction, nearly all of it on Amazon. (In the book's description, look for Independently Published, Create Space, or Lulu.) Some is pretty damned good (the best is often by authors who write in other genres and don't want this one to be connected), and more is not so good. Some, you pay for a book but get only 25 or 30 pages. Or it starts out good and evolves, or devolves, into something you don't want to see, like child porn or sexual assault portrayed as erotic. Yuck.
But with a trade publisher acting as a quality gatekeeper, everything is well done. The basic writing, how the author uses the language, is excellent. It's been through three editing passes. There's an actual plot featuring interesting people with whole lives that aren't all about sex--and they're doing some very interesting sexual things that have significance to the characters, who grow or change because of it.
You don't have to buy a print book to get a trade publisher; nearly all the erotica presses offer digital versions. They're usually sold at both the publishers' own websites and at Amazon and other online markets.
It's badly dated now, but I quite enjoyed Anne Rice's "Exit to Eden," about an exclusive resort island sex club. (The movie adaptation was just awful.)