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is pretty good, but it has a bit of a learning curve to get it right. You have to use the "Author's Note" and "Memory" fields to define the parameters of your scenario and to be extremely exact and somewhat repetitive in what you say so that the AI understands. It can give highly detailed and graphic descriptions of sex scenes ranging from vanilla to really brutal rape and torture scenes depending on what you write in those fields. It can also give very detailed descriptions of individual girls in terms of their physical characteristics and what they are wearing. It took me a lot of trial and error to figure out how to phrase everything so that I could get what I wanted.
NovelAI has updated several times since I started using it and there are several different versions that the player can choose from. I would recommend using "Krake" as the "AI Model" and "Blue Lighter" as the "Config Preset" since in my experience that is the most advanced setting that consistently yields the best results.
While NovelAI is fun and interesting to use and I use it almost daily, it isn't as good now as AI Dungeon was before its developers chose to destroy their own product. A key weakness that NovelAI has that AI Dungeon did not is that NovelAI has a hard time keeping track of multiple named characters. NovelAi has a "Logbook," which can be used to record individual characters so that in theory the AI will not forget them, but it only works so well. I have found that NovelAi works very well if my MC is monogamous or if he fucks a bunch of random girls without mentioning their names, but the AI has a really hard time keeping track of multiple named girls within the same story and will often mix them up. AI Dungeon was much more advanced in that regard. In AI Dungeon, I often had my MC start a harem, fuck multiple named girls, get them pregnant, and then have the girls give birth to multiple named daughters who would then grow up and become named characters themselves. AI Dungeon, at its height, could keep track of a dozen or more such named characters and how they related to each other and how the MC had treated them in the past. NovelAI may get there eventually, but for right now it is far more limited.