The medical paper and the adult-video category name examine the same physiological event from two very different lexical traditions.

Overview

Shiofuki (Japanese: 潮吹き) is the Japanese-language name for the expulsion of fluid through the female urethra at the peak of sexual arousal, and for the deliberate staging of that event as a performance category in adult video. The medical literature treats the same phenomenon as female ejaculation; English-language adult industry and community discourse calls it squirting. The fluid volume varies from a few millilitres to over 100 ml, and reported prevalence in the general female population ranges, across multiple surveys, from roughly 10% to 50%, indicating both real individual variation and the difficulty of standardising self-report.

The Japanese word, the English colloquial term, and the medical term all describe the same underlying physiological event but from positions inside three different vocabulary systems. The composition of the fluid, the anatomy involved, and the proportion of cases in which it represents a distinct phenomenon from ordinary stress urinary incontinence are all subjects of ongoing research.

Etymology

Shiofuki is a compound of shio (潮, “tide” or “saltwater”) and fuku (吹く, “to blow out”). The original referents are non-sexual: the visible exhalation of whales, the water expelled from clams as they open, sea spray. Premodern uses occur in classical and Edo-period literature without sexual meaning. The transfer to a sexual sense is attested in shunga and early-modern gesaku literature, where the term was used as a quasi-literary euphemism for female fluid expulsion. Through the Meiji and Showa periods the word survived as folk and underground vocabulary, and was reactivated in the postwar adult video industry as the name of a performance category.

The English squirting is the gerund form of squirt and entered Anglophone porn-industry usage from the 1990s. Female ejaculation is older: cases were already reported in nineteenth-century European medical writing, with the modern research literature beginning in the 1980s.

Research history

Documentation of female fluid expulsion at sexual arousal extends back through classical antiquity. Aristotle and Galen mention it; the seventeenth-century Dutch anatomist Reinier de Graaf describes it in De Mulierum Organis Generationi Inservientibus Tractatus Novus (1672). The modern medical research line is usually dated to the 1950 paper of the German-American gynaecologist Ernst Gräfenberg, which identified the G spot on the anterior vaginal wall and reported associated fluid release. The Ladas, Whipple, and Perry book The G Spot (1982) brought the topic to a general English-language readership.

In the 2010s, the French gynaecologist Samuel Salama and his collaborators combined ultrasound imaging with biochemical analysis of the released fluid (Salama et al., 2015). Their finding was that the principal source of the volume is the bladder, but that the fluid is biochemically distinguishable from ordinary urine, containing measurable amounts of prostate-specific antigen (PSA) traceable to the Skene’s (paraurethral) glands. The conclusion drawn is that female ejaculation is not a single phenomenon but a composite of urinary expulsion and Skene-gland secretion in varying proportions.

Anatomy

Two glandular structures are involved. The Skene’s glands (also called paraurethral glands or, in this context, the female prostate) lie around the urethra and produce a small volume of PSA-rich fluid. The Bartholin’s glands (Japanese: bartolin) at the vaginal opening contribute lubricating fluid that is not the principal source of squirting. The bladder remains the largest reservoir, and most documented squirting events involve some component of urethral expulsion of dilute urine, sometimes mixed with Skene-gland secretion.

A persistent question in the literature is the relationship between squirting and stress urinary incontinence. The Salama paper and subsequent work generally find that the two events are distinguishable both physiologically (the timing of the expulsion relative to orgasm) and biochemically (the PSA content), though the categories overlap in some cases.

Genre formation in Japanese AV

The thematic foregrounding of shiofuki in Japanese adult video began in earnest in the 1990s. The self-regulation regime of Eirin and the Nihon Video Rinri Kyōkai (Bideo Rinri) restricted direct depiction of penetration, and the female body’s visible response became a key element of visual closure in scenes where the act of penetration could not anchor the image. Shiofuki entered the standard production grammar alongside bukkake as a regulation-driven invention: a way to achieve visual climax under constrained imagery.

From the late 1990s onward, scenes built around the denma (electric massager, popularised in the AV setting after Hitachi’s Magic Wand of 1968) and a finishing shiofuki became one of the most stable templates in the industry. The genre then extended into combinations with chijo work, cunnilingus finishes, and continuous cowgirl positions, generating subgenres such as first shiofuki, 100-burst shiofuki, and orgasmic shiofuki.

International reception

The English-language term squirting travelled internationally through Anglophone pornography. A particularly notable moment in its regulatory history was the British Board of Film Classification’s 2014 R18 reclassification rules, which excluded squirting-content from R18 certification. The decision was criticised within the industry and by free-speech commentators, and was effectively reversed in 2019 after the AVMS Directive revisions. The episode is one of the few cases in which a specific female sexual-response category has been treated as a national regulatory issue.

Cultural and feminist discussion

Within sexology and gender-studies discourse, the visibility of female ejaculation is read variously: as a recognition of female pleasure historically suppressed; as an instance of female sexual response being made legible only when reproduced as a porn-industry image; and as a site of tension between the performance and the physiology of the event. Suzuki Suzumi’s AV Joyū no Shakaigaku (The Sociology of AV Actresses, 2013) examines the labour conditions under which the staging of intense bodily responses, including shiofuki, is required of performers, and notes the dual demand for appearing natural and delivering the goods.

The relationship between the documented physiological event and its industry staging is not a simple correspondence: industry scenes amplify and isolate the event for visual delivery, and the resulting image has its own conventions (the bow-trajectory arc, the slow-motion replay, the first shiofuki novelty framing) that reflect the production grammar of the medium rather than typical occurrence in the general population.

See also

• Cunnilingus (Kunni)
• Chijo
• Adult toys
• Masturbation (Onanie)
• Clitoris
• G spot
• Inkaku
• Denma
• Orgasm types
• Bartholin’s glands