Nude Imagery Rating System (NIRS)

The Nude Imagery Rating System (NIRS) offers a structured approach to classifying nude imagery based on artistic intent, realism, and potential for offense. This system categorizes images into five levels, from abstract representations to explicit content, providing a framework for content moderation and ethical considerations in AI-generated visuals.

Level 1: Abstract Symbolic Representation

Nude forms are highly stylized, simplified, or geometric, often appearing as cartoonish shapes, abstract figures, or exaggerated representations. This category includes minimalist depictions found in graphic design, animation, and conceptual art where anatomical accuracy is secondary to artistic expression.

Level 2: Classical Artistic Representation

Inspired by historical fine art traditions, this category includes works resembling those of the Renaissance, Neoclassical, or other artistic movements that emphasize anatomy, form, and aesthetic beauty. Nudity is often idealized, symbolic, or mythological, intended to evoke admiration rather than arousal.

Level 3: Cultural and Traditional Depictions

Nudity is presented within an indigenous or historical cultural context, often in the form of ceremonial art, body painting, or sculptures. These images are generally non-erotic and serve anthropological, documentary, or educational purposes. Their primary intent is to preserve or celebrate heritage rather than to provoke.

Level 4: Commercialized Erotic Depiction

Professionally produced nude imagery designed for broad erotic appeal, often featuring idealized bodies, stylized lighting, and carefully curated poses. While explicit sexual activity is not depicted, the intent is primarily sensual or provocative rather than artistic or documentary. This category includes glamour photography, pin-up imagery, and other forms of commercialized nudity that blur the line between fine art and adult entertainment.

Level 5: Explicit Pornographic Content

Imagery focused on sexual stimulation, including full nudity with overt genital display, explicit sexual acts, or poses that leave no ambiguity in intent. This category represents the most graphic and provocative forms of adult content, typically subject to age restrictions, content warnings, or legal regulation.