Movable joints are essential for achieving natural, lifelike poses and enhancing the realism of sex dolls. The most advanced models feature internal skeletons made of durable metals or plastics, allowing for a wide range of motion in key areas such as the neck, shoulders, elbows, hips, knees, and wrists. These joints are designed to mimic human anatomy, providing smooth, flexible movement without stiffness or unnatural resistance. Some dolls incorporate multiple points of articulation, enabling complex positions and dynamic postures that enhance interaction authenticity. The use of high-quality materials for joint components ensures durability, so the doll maintains its flexibility over time. Adjustable joints also allow users to customize poses easily, creating a personalized experience. Additionally, some dolls come with mechanisms that enable internal movement or even subtle body shifts, making interactions more spontaneous. The combination of realistic joint articulation and durable internal frameworks results in sex dolls that not only look human but also move and pose convincingly, elevating the overall sense of realism.