The Japanese "Customs Business Law" has flexible interpretation of the display regulations of the hentai sex doll, and alien sex dolls are easier to evade censorship with their non-human characteristics. A case seized by the Osaka police in 2024 showed that an exhibitor displayed an alien sex doll with a realistic function in the name of "science fiction installation art", but was eventually exempted from prosecution due to the vague definition of "human form proportion" in the law. This legal loophole is being widely used by the industry, forcing the legislature to redefine the quantitative standard of "human simulation".