PixAI SDXL Prompting Guide – Foundations: Why Does AI Default to Drawing Girls?

Editor’s note (PixAI)

This guide was written by one of our community’s standout creators, 阿童 (ATone), and is republished here with credit to the original author.

• Original website
• ATone on PixAI

By analyzing Danbooru training data, this article reveals why models default to female characters and establishes the foundational logic needed to overcome the AI’s inherent habits.

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The One-Sentence Answer

It’s a numbers game: In the “textbooks” AI uses to learn how to draw, there are over four times as many images of girls as there are of boys.

The Deep Dive

Where the Training Data Comes From

Mainstream anime-style models (like Illustrious XL, NoobAI, and Pony) primarily pull their knowledge from:

Image Board	Content Characteristics
Danbooru	Japanese anime image board; female characters are the majority
e621	Anthro/Furry image board; content is more diverse.

Danbooru is the largest source of training data, and the images collected on that site feature significantly more female characters than male characters.

What Does This Mean?

AI models learn through “statistical patterns”:

• Seeing 1 million images of “Blue Hair + Girl” → When seeing “Blue Hair,” the AI tends to draw a girl.
• Seeing 1 million images of “Indoor Scene + Girl” → Drawing an indoor scene easily results in a girl appearing.
• Only seeing 50,000 images of “Boys” → The ability to draw boys is relatively weak.
• Only seeing 30,000 images of “Pure Scenery” → People easily appear in scenery images.

Conclusion: It is not that the model “cannot” draw other things; rather, it requires clearer and stronger instructions.

Actual Data

Taking Danbooru tag counts as an example (Data from 2024-12-22):

Tag	Count	Description
1girl	6,008,644	Single female character
1boy	1,405,457	Single male character
no humans	147,269	No humans

Key Figures:

• 1girl vs. 1boy: Images tagged with 1girloutnumber1boy by 4.3 to 1.
• Solo Portraits: Roughly 81% are female, while only 19% are male.
• Scenery/Objects: Tags like no humans account for only about 2% of the total library.

How Does This Affect Your Art?

What you want to draw	Common Issues
Male Characters	Become female or feminized
Pure Scenery/Objects	Humans appear inexplicably
Mecha/Monsters	Become feminized or a pilot appears
Multi-character Compositions	Everyone becomes a girl.
BL (Boys’ Love)	Turns into BG (Boy/Girl) or GL (Girls’ Love).

General Solutions

1. Explicitly state what you want — Do not assume the model knows.
2. Explicitly state what you do NOT want — Negative prompts are very important.
3. Choose the right model — Some models perform better on specific themes.
4. Use LoRAs — Fine-tune for specific styles or characters.

For detailed operations, please refer to the specialized chapters for each topic.