The design of the alien sex doll is essentially a wild biomechanical imagination. Engineers break free from the shackles of ergonomics: the ball joints that can rotate 720 degrees can achieve octopus-like winding, the built-in hydraulic device simulates the unique pulsation of alien body fluids, and even designs a tactile experience with a completely unfamiliar vibration frequency through the assumption of non-carbon-based life forms. Every contact is a re-mapping of the threshold of human senses. This extreme exploration of "inhuman pleasure" is exactly the same as the deconstruction of traditional erotic symbols by the hentai sex doll. The latter challenges the morphological definition of desire with impossible body proportions and organ mutations, proving that pleasure can be completely separated from the primitive logic of biological evolution and reconstructed in pure fantasy.