Trained over six hours for 4000 steps from a dataset of ~900 images from r/TwinksAndTwunks, r/CollegeBoys, some professional solo gay porn image albums, and a few other places I don't remember. Annotated using abliterated Gemma 4.

Seems alright.

If it helps anyone, here is the AI-Toolkit config I used:

---
job: "extension"
config:
  name: "moss_men"
  process:
    - type: "diffusion_trainer"
      training_folder: "/workspace/output"
      sqlite_db_path: "./aitk_db.db"
      device: "cuda"
      trigger_word: null
      performance_log_every: 10
      network:
        type: "lora"
        linear: 64
        linear_alpha: 64
        lokr_full_rank: true
        lokr_factor: -1
        network_kwargs:
          ignore_if_contains:
            - "layers.22."
      save:
        dtype: "bf16"
        save_every: 250
        max_step_saves_to_keep: 4
        save_format: "diffusers"
        push_to_hub: false
      datasets:
        - folder_path: "/workspace/Images/Dataset"
          mask_path: null
          mask_min_value: 0.1
          default_caption: ""
          caption_ext: "txt"
          caption_dropout_rate: 0.05
          cache_latents_to_disk: true
          is_reg: false
          network_weight: 1
          resolution:
            - 1024
          controls: []
          shrink_video_to_frames: true
          num_frames: 1
          flip_x: false
          flip_y: false
          num_repeats: 1
      train:
        batch_size: 2
        bypass_guidance_embedding: false
        steps: 4000
        gradient_accumulation: 1
        train_unet: true
        train_text_encoder: false
        gradient_checkpointing: false
        noise_scheduler: "flowmatch"
        optimizer: "adamw8bit"
        timestep_type: "shift"
        content_or_style: "balanced"
        optimizer_params:
          weight_decay: 0.0001
        unload_text_encoder: false
        cache_text_embeddings: false
        lr: 0.0002
        ema_config:
          use_ema: false
          ema_decay: 0.99
        skip_first_sample: true
        force_first_sample: false
        disable_sampling: false
        dtype: "bf16"
        diff_output_preservation: false
        diff_output_preservation_multiplier: 1
        diff_output_preservation_class: "person"
        switch_boundary_every: 1
        loss_type: "mse"
      logging:
        log_every: 1
        use_ui_logger: true
      model:
        name_or_path: "OpenMOSS-Team/MOSS-Image-Base"
        quantize: true
        qtype: "convrot8"
        quantize_te: true
        qtype_te: "convrot8"
        arch: "moss_image:base"
        low_vram: true
        model_kwargs:
          uncond_skip_layers:
            - 22
        compile: false
        layer_offloading: false
        layer_offloading_text_encoder_percent: 1
        layer_offloading_transformer_percent: 1
      sample:
        sampler: "flowmatch"
        sample_every: 250
        sample_start_step: 0
        width: 1024
        height: 1024
        samples:
          - prompt: "A man stands in front of a mirror in a bathroom, taking a selfie with a silver smartphone. He has short dark hair, a goatee, and a mustache. He is wearing a white tank top that is pulled up to expose his abdomen, which has a small patch of dark hair around the navel. His lower body is partially clothed in black pants, which are pulled down to reveal his genitals. His penis is erect, with the shaft and glans visible, and he is holding it with his right hand. The background features black tiled walls with white grout, and a white door is visible to the left. The lighting is bright, casting clear shadows and highlighting the textures of the tiles and the man's skin. The overall atmosphere is casual and intimate, capturing a private moment."
            width: 768
            height: 1024
          - prompt: "The image depicts a person standing in a laundry room, captured from the waist down. The individual is wearing a red short-sleeve shirt and light blue underwear with a gray waistband. They are holding a tennis racket with a black frame and white grip, gripping it with their right hand. The racket is positioned in front of their body, with the head angled downward. The person's penis is erect and visible through the open waistband of their underwear, pointing downward. The penis goes through the truss of the racket. The background includes a white washing machine and dryer stacked vertically, with various items on top of the dryer. The walls are plain and light-colored, and the floor appears to be a neutral tone. The lighting is bright, casting clear shadows and highlighting the textures of the clothing and the racket. The overall atmosphere is casual and candid, capturing a moment in a domestic setting."
            width: 768
            height: 1024
        neg: ""
        seed: 42
        walk_seed: true
        guidance_scale: 3
        sample_steps: 50
        num_frames: 1
        fps: 1
meta:
  name: "[name]"
  version: "1.0"