A common meme is that anime-style SD models can create anything, as long as it's a beautiful girl. We know that with good prompting that isn't really the case, but I was still curious to see what the most popular models show when you don't give them any prompt to work with. Here are the results, more explanations follow:

The results, sorted from least to most horny (non-anime-focused models grouped on the right)

Methodology
I took all the most popular/highest rated anime-style checkpoints on civitai, as well as 3 more that aren't really/fully anime style as a control group (marked with * in the chart, to the right).
For each of them, I generated a set of 80 images with the exact same setup:

prompt: 
negative prompt: (bad quality, worst quality:1.4)
512x512, Ancestral Euler sampling with 30 steps, CFG scale 7

That is, the prompt was completely empty. I first wanted to do this with no negative as well, but the nightmare fuel that some models produced with that didn't motivate me to look at 1000+ images, so I settled on the minimal negative prompt you see above.

I wrote a small UI tool to very rapidly (manually) categorize images into one of 4 categories:

• "Other": Anything not part of the other three
• "Female character": An image of a single female character, but not risque or NSFW
• "Risque": No outright nudity, but not squeaky clean either
• "NSFW": Nudity and/or sexual content (2/3rds of the way though I though it would be smarter to split that up into two categories, maybe if I ever do this again)

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Overall Observations

• There isn't a single anime-style model which doesn't prefer to create a female character unprompted more than 2/3rds of the time. Even in the non-anime models, only Dreamshaper 4 is different.
• There is a very marked difference in anime models, with 2 major categories: everything from the left up to and including Anything v5 is relatively SFW, with only a single random NSFW picture across all of them -- and these models are also less likely to produce risque content.

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Remarks on Individual Models
Since I looked at quite a lot of unprompted pictures of each of them, I have gained a bit of insight into what each of these tends towards. Here's a quick summary, left to right:

• tmndMixPlus: I only downloaded this for this test, and it surprised me. It is the **only** model in the whole test to produce a (yes, one) image with a guy as the main character. Well done!
• CetusMix Whalefall: Another one I only downloaded for this test. Does some nice fantasy animals, and provides great quality without further prompts.
• NyanMix_230303: This one really loves winter landscape backgrounds and cat ears. Lots of girls, but not overtly horny compared to the others; also very good unprompted image quality.
• Counterfeit 2.5: Until today, this was my main go-to for composition. I expected it to be on the left of the chart, maybe even further than it ended up with. I noticed a significant tendency for "other" to be cars or room interiors with this one.
• Anything v5: One thing I wanted to see is whether Anything really does provide a more "unbiased" anime model, as it is commonly described. It's certainly in the more general category, but not outstanding. I noted a very strong swimsuits and water bias with this one.
• Counterfeit 2.2: The more dedicated NSFW version of Counterfeit produced a lot more NSFW images, as one would expect, but interestingly in terms of NSFW+Risque it wasn't that horny on average. "Other" had interesting varied pictures of animals, architecture and even food.
• AmbientGrapeMix: A relatively new one. Not too much straight up NSFW, but the "Risque" stuff it produced was very risque.
• MeinaMix: Another one I downloaded for this test. This one is a masterpiece of softcore, in a way: it manages to be excessively horny while producing almost no NSFW images at all (and the few that were there were just naked breasts). Good quality images on average without prompting.
• Hassaku: This one bills itself as a NSFW/Hentai model, and it lives up to that, though it's not nearly as explicit/extreme about it as the rest of the models coming up. Surprisingly great unprompted image quality, also used it for the first time for this test.
• AOM3 (AbyssOrangeMix): All of these behave similarly in terms of horniness without extra prompting, as in, they produce a lot of sexual content. I did notice that AOM3A2 produced very low-quality images without extra prompts compared to the rest of the pack.
• Grapefruit 4.1: This is another self-proclaimed hentai model, and it really has a one-track mind. If not for a single image, it would have achieved 100% horny (Risque+NSFW). Good unprompted image quality though.

I have to admit that I use the non-anime-focused models much less frequently, but here are my thoughts on those:

• Dreamshaper 4: The first non-anime-focused model, and it wins the award for least biased by far. It does love cars too much in my opinion, but still great variety.
• NeverEndingDream: Another non-anime model. Does a bit of everything, including lots of nice landscapes, but also NSFW. Seems to have a a bit of a shoe fetish.
• RevAnimated: This one is more horny than any of the anime-focused models. No wonder it's so popular ;)

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Conclusions

I hope you found this interesting and/or entertaining.
I was quite surprised by some of the results, and in particular I'll look more towards CetusMix and tmnd for general composition and initial work in the future. It did confirm my experience that Counterfeit 2.5 is basically at least as good if not better a "general" anime model than Anything.

It also confirms the impressions I had which caused me to recently start to use AOM3 mostly just for the finishing passes of pictures. I love the art style that the AOM3 variants produce a lot, but other models are better at coming up with initial concepts for general topics.

Do let me know if this matches your experience at all, or if there are interesting models I missed!

IMPORTANT
This experiment doesn't really tell us anything about what these models are capable of with any specific prompting, or much of anything about the quality of what you can achieve in a given type of category with good (or any!) prompts.