The legs come up. The knees fold. From above, the resulting line of thigh and calf describes the letter M. The pose has a Japanese name — M-ji kaikyaku, M-shaped legs apart — and a particular position in the visual-history of postwar Japanese commercial-erotic photography. The pose itself is anatomically simple; its cultural weight is anything but.

Overview

M-ji kaikyaku (Japanese: M字開脚, M-ji kaikyaku; English working translations: M-spread, M-shaped legs pose, M-leg spread) is the bodily pose in which the subject lies supine or sits in a half-recline, bends both knees at approximately ninety degrees, and spreads the knees apart so that the resulting line of upper-and-lower legs from a viewing angle above describes the letter M. The pose is a photographic-pose category rather than an anatomical-position category — its name comes from the visual letter-shape the legs form, not from any physiology-and-mechanics description.

The pose is one of the central reference-poses of contemporary Japanese commercial gravure photography, AV, and adult-comics. From the 1990s onward, the M-spread has occupied a recurring position in gravure cover-and-spread layout, AV scene-grammar, and adult-comics composition. Its cultural-historical position is anchored in the 1991 Hair-Disclosure (hair-nude) period — the period during which the previously-strict regulation of pubic-hair display in Japanese photography was loosened — and the pose acquired its standalone independence as a photographic-pose category in the period that followed.

Three distinct functional registers organise the pose’s contemporary use. In gravure photography, the pose operates as a suggestion-of-display register where clothing-or-swimsuit covers preserve the legal-and-conventional limits on direct exposure while the pose itself reads as a maximum-disclosure visual. In AV, the pose operates as a moment-of-disclosure register that the production grammar uses to mark the transition from preliminary scenes to the central body of the production. In adult-comics, the pose operates as a large-panel composition register that the comic’s panel-layout uses to focus extended reader-attention on a specific page-moment.

The pose’s cultural weight

The pose’s cultural-historical weight rests on the broader Japanese postwar visual-body politics. From the postwar through the late 1980s, Japanese commercial-erotic photography operated under tight regulatory-and-conventional constraints concerning pubic-hair and genital display: Article 175 of the Penal Code (the obscenity-statute), the Customs-import-inspection regime, and the adult-publishing industry’s self-regulatory practices combined to produce a visual conventional-default in which the pose-equivalent-to-M-spread might be photographed but would have its lower-image regions covered with clothing, edited with retouching, or reframed to crop the relevant area.

The 1991 publication of Shinoyama Kishin’s photograph-collection Santa Fe — featuring nude photographs of the actress Miyazawa Rie, with pubic hair visible in the printed images — opened a new possibility for Japanese photographic publication. The subsequent four-or-five-year hair-nude period saw the Japanese photographic-publication industry’s content-conventions expand substantially, and the M-spread as a standalone pose without genital-area coverage entered the photographic repertoire as a working visual-pose category. The pose’s contemporary cultural-historical position is anchored in this period.

The M-spread is not, per se, a sexual-position. As a position-of-coupling between two bodies, it serves as the receiving-partner posture in a missionary-coupling configuration. As a standalone pose, however — the focus of this article — it is a photographic-and-display pose rather than a sexual-coupling-position, and its cultural significance is as a photographic-pose category.

”M-shape” naming

The Japanese-language convention of naming bodily poses with letter-shape descriptions — dai-no-ji (大-shape), Y-ji (Y-shape), I-ji (I-shape), gyaku-sa-no-ji (反-the-shape) — has wide application across athletics, dance, photography, and martial arts. M-ji-kaikyaku sits within this broader naming-convention as a particularly visually-direct example: the pose’s name describes its letter-shape directly, and the name’s transparency to its referent is part of what makes the term colloquially-functional.

The bent-knee-and-spread pose itself is, of course, anatomically commonplace. It appears in childbirth-and-obstetric examination contexts (the lithotomy position), in yogic practice (the baddha koṇāsana / bound-angle pose has structural-similarities), and in the visual conventions of pre-modern Japanese erotic-print (shunga) tradition where the pose-arrangement appears as a recurring element. What is new in the modern M-spread is not the pose itself but the standalone-pose-as-photographic-category status it has acquired. The shunga-tradition use of the bent-knee-spread arrangement embedded the pose within sexual-coupling scenes; the modern M-spread separates the pose from the coupling-context and presents it as the photograph-or-frame’s primary subject.

History in gravure photography

Pre-hair-disclosure (1970s–1980s)

The postwar Japanese gravure-photography tradition developed through magazines including Heibon Punch (founded 1964), Weekly Playboy (founded 1966), GORO (founded 1971), and the broader weekly-magazine and adult-magazine market. The bikini-and-lingerie pin-up tradition this period produced operated under the regulatory-and-conventional constraints noted above: the M-spread-equivalent poses were photographed but with clothing-and-swimsuit cover, and the magazine-editorial practice was the negotiated balance of the visual-suggestion-of-disclosure with the regulatory-required cover.

This period’s visual-grammar developed the show-and-not-show register that would characterise much of subsequent Japanese gravure aesthetic. The pose-suggestion of opening-up while the actual disclosure remains covered by garment-and-swimsuit is the structural-grammar that the period’s photographers-and-magazine-editors developed.

Hair-disclosure (1991–1995)

The publication of Santa Fe in November 1991 marked the structural-shift point. The negotiated boundary between art and obscenity was repositioned in print-publishing practice, and the four-or-five-year period of expanded photographic-content-conventions followed. Inoue Shōichi’s The Birth of Hair-Nude (Hair-Nude no Tanjō, 1996) treats the period as the cultural-historical-event of a politically-renegotiated boundary in Japanese mass-publishing.

The M-spread’s emergence as a standalone-pose photographic-category followed from this opening. The pose, when photographed without garment-cover, became part of the photographic vocabulary of the period — and the pose-category-name (M-ji-kaikyaku) consolidated as the working-vocabulary for the photograph-type. By the mid-1990s, the M-spread was an established pose in gravure-photography practice.

Post-1990s consolidation (mid-1990s onward)

Through the late 1990s and 2000s, the M-spread became one of the standard gravure-pose-categories used in gravure idol photo-collection photography and in mass-circulation gravure-magazine layouts. Yasuda Rio’s Complete History of Japanese Pornography (Nihon Erohon Zenshi, 2019) documents the continued development of the genre through the 1990s and 2000s, with the M-spread occupying a stable position in the period’s visual vocabulary.

By the 2000s, the photographic conventional-default had stabilised: the M-spread was a standard pose category, the underlying pose-and-photograph relationship was familiar to both photographers and readers, and the pose’s compositional-and-aesthetic resources were well-developed. Subsequent variations — the M-spread photographed from above, from below, from the side; with various costume-and-styling variations; in indoor-and-outdoor settings — extended the basic pose-category into a substantial repertoire.

Position in AV grammar

In AV production, the M-spread occupies a recognisable structural position in scene-grammar.

Display moment. The pose is typically used in transitions, with the production cutting to an M-spread frame at the threshold-moment between scene-segments. The pose’s stable-and-still composition makes it useful as a punctuation-element within the production’s broader pacing-grammar.

Pre-coupling visual. Before the start of an extended coupling-scene, the M-spread frame functions as the moment of disclosure that marks the transition. Given that AV production’s regulatory-and-conventional constraints require mosaic-coverage of explicit genital and coupling imagery (Article 175 and the corresponding industry self-regulation), the M-spread frame’s pre-coupling-display role substitutes structurally for the visual-explicit material that the regulatory framework excludes.

Female-active scenes. In productions in the chijo (dominant-woman) genre, the M-spread is reframed: rather than the female performer being placed-in-display by the camera, the female performer takes-the-pose actively as part of her scene-actively-directing role. The same pose, with the same physical configuration, reads in different production-grammar registers as either passive disclosure or active offering — a particularly clear example of how the surrounding production-grammar shapes the reading of the visual content.

Hamedori (POV) production. In POV (hamedori) production, the M-spread frame functions as the central composition-element of the first-person-camera visual setup, with the camera positioned as the filming-partner’s viewpoint and the M-spread visible across the receiving-partner’s-legs. The pose’s compositional logic is well-suited to this camera-position, and the pseudo-first-person register is one of the principal places where the M-spread appears in AV production.

Adjacent and related poses

Crosslegged-spread (agura-kaikyaku): the soles-of-feet-together pose with the knees fallen outward (corresponding to yoga’s baddha koṇāsana / bound-angle pose). The leg-shape from above describes a diamond rather than an M, and the pose has a softer-and-more-relaxed register in gravure use.

Kannon-biraki (V-spread): the pose in which the receiving partner reaches with both hands to the inner thighs and pulls them outward, “opening the gates” in the visual-pun on the Buddhist temple’s bilateral-doors. The pose is closely related to the M-spread but adds the active-self-display element through the hand-positioning. The kannon-biraki is sometimes treated as the active-self-display variant of the M-spread.

Mangurigaeshi (folded-flexion): the supine pose with both legs folded back over the head and the hips lifted. Where the M-spread is “the M standing-up”, mangurigaeshi is “the M folded-over”. The two poses share an underlying leg-bent-and-spread logic but apply that logic in opposite directions.

Standalone-pose-vs-coupling-position. The M-spread, as the receiving-partner’s posture in a coupling-position, is the conventional-default of the receiving partner in missionary. The receiving-partner’s pose in the coupling-position is the same as the standalone-photographic M-spread; the difference is whether the inserting-partner is present.

Differences across media

The pose’s reception-register shifts according to the medium in which it appears.

Gravure: the pose is implemented as a suggestion of display with the genital-area covered by swimsuit, lingerie, or other garment. The visual focus is on the gesture-of-opening rather than on the explicit display, and the pose’s reading-register is correspondingly more aestheticised-and-suggestive.

AV: the pose is implemented as a moment of display before or during the production’s central body. The mosaic-coverage of the regulatory-required-zones is in place, and the pose functions structurally to substitute for the visual content the regulatory framework excludes.

Adult comics (eromanga): the pose is implemented as a large-panel-composition feature, with the comic-panel-layout using the pose’s strong compositional-form to anchor a panel of expanded size. The static comic-frame allows extended reader-attention to the panel, and the pose’s compositional weight makes it useful for that purpose.

The same pose, in three media, with three structurally-different reading-grammars. The M-spread’s adaptive use across the three media is one of the more legible examples of how a single visual-element shifts in significance with its surrounding production-grammar.

Cultural and gender-studies discussion

In Japanese-language critical commentary on the postwar visual-body-politics (Inoue Shōichi’s The Birth of Hair-Nude, the broader 1990s discourse on the disclosure-and-art boundary, the gender-studies analysis of gravure-and-AV production), the M-spread occupies a recognisable position as one of the visual-elements that the period’s renegotiation of public-display-conventions produced. Gender-studies analysis of the pose has noted both the passive-display and the active-offering registers in which it can read, with the surrounding production-grammar determining which register a given image-or-scene activates.

The conversation about the M-spread’s place in the broader visual-body politics is not closed. The pose’s recurring use across decades of Japanese commercial-erotic-media production, its specific anchoring in the 1991-and-after hair-disclosure period, and its capacity to read in different registers within different production-grammars make it a particularly informative example of the inter-relations between visual-pose, regulatory-context, production-grammar, and reading-reception.

Related Terms

• Missionary (seijoui)
• Woman-on-top (kijoui)
• Matsubakuzushi (V-position)
• Chijo (dominant woman)
• Gravure
• Photo-collection (shashinshū)
• Eromanga
• Kannon-biraki (V-spread)
• Hamedori (POV)