A wife stands facing forward, places her hands on the floor behind her, and bends her upper body into a deep backward arch. Her husband stands behind her and enters from the rear. The arched body resembles the panels of a household Buddhist altar tipped backward off its stand. The Edo erotic-book writers called this configuration butsudan-gaeshi, the altar-turn, and treated it as one of the visually-extreme entries in the forty-eight-positions canon.

Butsudan-gaeshi (Japanese: 仏壇返し, butsudan-gaeshi, “altar-turn”) is one of the variants in the Edo-period forty-eight positions (shijūhatte) classification, in which the man and woman face the same direction in a standing or seated configuration, the woman places her hands on the floor behind her and bends her upper body into a deep backbend, and the man enters from her back side. The name references the falling-backward motion of the panels of a household Buddhist altar (butsudan), and the position belongs to the rear-entry-standing class with an extreme backbend axis.

Etymology

The name carries multiple readings. One reading interprets the Buddhist-altar (butsudan) reference as a comparison to the kannon-biraki — the temple-doors-style hinged-panel construction of the altar, with the panels tipping backward in a parodic-extreme image of normal altar-opening. Another reading interprets the butsudan directly as the altar-furniture-object itself, with the woman’s backward-bending body compared to the entire altar being tipped over backward in a dramatic reversal.

In either reading, the operation of using a religious household-object as the source-domain for a sexual-position metaphor is a characteristic move of Edo-period erotic-book writers. The act of importing the Buddhist altar — a religious sacred object — into the naming of a sexual gesture exhibits the playful-religious-vocabulary tradition of Edo townspeople, whose religious sensibility was thoroughly integrated with the playful, the comedic, and the sexual aspects of daily life. The Edo period’s religious-and-secular continuity is on display in this naming, in contrast to the strict sacred-secular separation that characterises modern post-Enlightenment sensibility.

The name butsudan-gaeshi appears in late-Edo erotic-book compendia including Keichū Kibun Makura Bunko by Keisai Eisen. Whether the configuration was named in the early Hishikawa Moronobu period of the forty-eight-positions tradition (1670s) cannot be confirmed from the surviving record. The name lacks the courtly-refinement of some forty-eight-positions names (such as futamigaura or goshokuruma) but compensates with the visual-extremity of the configuration it documents.

Movement

The basic posture begins with the two partners facing the same direction in a standing or seated configuration. The woman stands in front of the man with her back to him. She places both hands on the floor or on a low platform behind her. Her upper body bends back into a deep arch, with her head dropping toward the floor. The man positions behind her and supports her hips while entering her from the rear.

The angle of insertion is determined by the tilt of the backbent woman’s pelvis. The anterior pelvic tilt resulting from the backbend produces an insertion-angle in which the glans presses firmly against the anterior wall of the vagina (the abdominal-facing wall), with deep penetration. The man supports the woman’s hips and produces the rhythm through anterior-posterior motion of his own hips. The woman supports her upper-body weight through her arms, with her head positioned in a near-inverted angle toward the floor.

The postural difficulty is high. The woman simultaneously requires arm-strength, hip-flexibility, and core-strength, and prolonged maintenance is difficult. The man’s side requires arm-strength to support the woman’s hips and self-balance against the backbent configuration. In Edo erotic-book depictions, the configuration is shown as a brief held-pose for visual effect, and in practical execution it is similarly limited to short-duration phases.

A derived form positions the woman on a chair or seated on a piece of furniture, with her upper body bending back over the seat or chair-back. This derived form reduces the postural load relative to the standing form and allows longer maintenance.

Treatment in classical literature

The butsudan-gaeshi configuration tends to appear in the later half of forty-eight-positions erotic-book sequences, often in the visually-extreme group with other dramatic-pose configurations. The depictions typically show the woman in a deep backbend with hands on the floor and head near-inverted, viewed in profile, with the man behind her at a kneeling or standing position. The visual emphasis falls on the engaged hip-junction at the centre of the composition. Some compositions include the implicit-altar imagery through the geometric lines of furniture, fusuma sliding-doors, or wall-panels in the background.

The accompanying text uses expressions such as “like the doors of the altar falling backward” and “the dread of the body bent back and facing the sky”, emphasising the metaphorical source and the dramatic character of the gesture. The Utagawa Kunisada and Katsushika Hokusai erotic-book corpora include compositions consistent with butsudan-gaeshi-type configurations, with Hokusai’s compositions notably using the body’s arched curve as a structural element in the overall design.

Reception and connotation

Butsudan-gaeshi maximises both the woman’s physical load and the visual drama of the depiction. The extreme backbend configuration opens the woman’s abdomen, breasts, and throat upward to the picture-plane, producing a maximum-disclosure configuration of the body. The man’s side is placed in an embracing-controlling configuration with respect to the woman, and the asymmetry of the configuration is explicit.

The playful-religious character of the naming adds a distinctive flavour to the psychological register. The Edo-period townspeople’s religious sensibility — in which everyday sacred objects could be appropriated for comic, theatrical, or sexual-vocabulary use without any sense of category-violation — is one of the things that the name documents. The double-register of respect-and-profanation toward the household altar coexists in the naming, in a way that strikes the post-Enlightenment-modern sensibility as transgressive but which was within the normal range of Edo-period comic operations.

In contemporary adult-video and adult-content vocabulary, the butsudan-gaeshi configuration is occasionally referenced under names such as “bridge position” or “backbend rear-entry.” The Pixiv-encyclopedia and similar contemporary subcultural-vocabulary databases include independent entries for the butsudan-gaeshi under the broader forty-eight-positions revival context. Productions featuring performers with gymnastic-or-acrobatic body-control occasionally foreground the extreme-backbend body-capability dimension.

Adjacent configurations

The butsudan-gaeshi sits within the standing-rear-entry class of the forty-eight positions, distinguished by the addition of the extreme-backbend axis.

Tachi-bakku (standing rear-entry) is the standard standing-rear-entry without the backbend.

Yotsunbai (on-all-fours) is the standard kneeling-rear-entry configuration.

Matsuba-kuzushi is a side-lying-half-lateral configuration with one leg elevated.

The daruma-gaeshi (Daruma-doll-turn) is a folded-extreme configuration emphasising the flexion-axis rather than the backbend-axis.

The distinguishing feature of the butsudan-gaeshi is the backbend-axis as the principal extreme. Among the forty-eight-positions canon, backbend-axis configurations are uncommon, and the butsudan-gaeshi is the principal representative of this kinematic class.

Cultural references

The butsudan-gaeshi naming is repeatedly cited in forty-eight-positions research as an extreme example of religious-vocabulary appropriation in Edo erotic-book vocabulary. The work of Nagai Yoshio, Shirakura Yoshihiko, and other contemporary scholars of the forty-eight-positions canon treats the butsudan-gaeshi as a representative case of “profanatory-naming,” an instance of the Edo townspeople’s playful-religious sensibility. The related case of kannon-biraki — which also borrows from Buddhist-altar imagery, in this case the temple-doors-construction of the altar — places the butsudan-gaeshi within a small sub-genre of religious-furniture-derived position-names.

From the perspective of folkloric and religious-cultural history, the operation of importing the household altar (a domestic-sacred-space) into the naming of a sexual gesture documents the religious-secular continuity of pre-modern Japanese sensibility. The configuration may appear transgressive to a post-Enlightenment-modern sensibility that strictly separates the sacred from the secular, but in the Edo-period context, the altar was part of daily life, and its playful appropriation into other vocabulary-domains was within the normal range of Edo-period word-play.

Related Terms

• Tachi-bakku (standing back-position)
• Yotsunbai (on-all-fours)
• Kannon-biraki (temple-doors-open)
• Matsuba-kuzushi
• Shunga — the medium in which the name circulated