Party Time - Female Nudity [Klein 4B, Klein 9B]

I ported this over from the Klein 9B which I had working a month ago. It seems to work fine for me but I'm not a Klein4B expert, I've spent most time in 9B. If you in 4B I gotta say the 9B is pretty sweet and hard to come off of back to 4B, try to get a bigger GPU! :)

The reason this port took a while is that I fussed with some improvements which didn't give much boost (regularization data, more training data, LR, rank).

If you get too much nudity (like nipples on top of sheer tops or bras) then just turn the strength to 0.8. If you aren't getting enough nudity then try strength = 1.2.

Klein both 4B and 9B have some funny and strong biases, like "college girl naked on campus" for some reason is really hard to get to work. The default model never does it and I can get topless about half the time with that prompt, using this LoRA. They must have post-trained the shit out of the model to block prompts like that. In order to force that reliably I would have had to overcook the LoRA so I didn't go that hard.

Summary: --> Unlock Klein-4B and Klein-9B for nude females

This is a lightweight style LoRA (rank=16, 40MB) to nudge Flux2-Klein-[4/9]B-Base to show nude female bodies without so much prompt struggle. It's ironic that BFL is German yet was so prudish in their post-training filters. For instance, in the base Klein model without any LoRAs, "naked woman" will often put her in a bra or swimsuit or even full clothes, which is frustrating.

The attempt here is to give only a little push to the model. If this LoRA errs, it should be by not doing enough rather than messing up your complex scenes. At least that's my intention.

Use guidance <= 4.0 and lora_strength <= 1.0 or else you can get some overcooked effects like naked pink nipples drawn on top of "thin cotton" tops, or nipples on a topless woman that are too brightly colored, for example. If you see those effects anyway, then try lora_strength=0.7.

Trigger words: this is a style LoRA with no specific trigger word. The qwen3 embedding is good at picking up any nudity as described in your prompt, so anything in the realm of "naked" "topless" "nude" "tits out" etc. should get the job done just fine and trigger the LoRA. Also the LoRA can infer nudity from context, so if you just say "woman in sauna" or "woman showering" she might show up nude even if you didn't say so explicitly, whereas in the base model she'll often be wearing a towel or swimsuit with that kind of prompt.

They say (and by "they" I mean Claude and Gemini) that one can use a LoRA trained on Klein-9B-Base on the Klein-9B (distilled) model, perhaps with more strength of 1.2-1.3, but I haven't tried it. lmk!

Tech notes for the LoRA training: SimpleTuner, 400 training images with precise captions, default sampler (Euler I think), learning_rate=5e-5, gradient_accumulation_steps=4, guidance=4, steps=5000, caption_dropout_probability=0, lora_dropout=0.05, lora_rank=16, lora_alpha=16, training time 10 hours.

Note: Klein is shy by default. This won't make the base model do genitals, nude dicks, or porn.

모델 유형	LORA
기본 모델	Flux.2 Klein 4B-base
게시일	2026-04-09

Party Time - Female Nudity [Klein 4B, Klein 9B]

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