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

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

This is a lightweight style LoRA (rank=16, 20-40MB) to nudge Flux2-Klein-[4/9]B 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.

This model works for inference in both distilled and base Klein. It was trained on base.

For distilled models, use guidance=1 and steps=4 as normal. I use mostly lora_strength=0.7 but you can experiment higher and lower.

For base models, use guidance <= 4.0 (5 can be ok but no higher or you get deformed limbs) 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 raw (non-LoRA) model she'll often be wearing a towel or swimsuit with that kind of prompt.

Tech notes for the LoRA training: SimpleTuner, 400 training images with precise captions, Euler sampler, 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: Trained on naked females, a few kissing is about as hardcore as it gets. This won't do dicks or sex.