A video of a “convulsive orgasm”—which has sparked buzz on overseas websites with comments like, “So this is how Japanese women climax?!”—can be found right here, lol. Could this lead to an even greater surge in the popularity of Japanese women?
Video
The true nature of “spasmodic orgasm” is the myotonic phenomenon.
The reactions seen in videos—popular abroad—that depict “convulsive orgasms” can be explained by a phenomenon in sexology known as myotonia, or involuntary muscle contraction. Research from the University of Groningen in the Netherlands indicates that during a genuine orgasm, the muscles surrounding the anus contract at a distinct rhythm of 8–13 Hz—a pattern that can be distinguished from intentional, simulated convulsions.
This rapid cycle of contractions is a hallmark of the “orgasmic phase”—a term coined by Masters and Johnson in their 1966 four-stage model. Involuntary responses, such as vocalizations and full-body spasms, are also considered physiological phenomena specific to this phase.



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