The skeleton structure of a sex doll significantly impacts its poseability, durability, and realism. There are primarily three types of skeletons used in high-quality dolls: static, semi-articulated, and fully articulated. Static skeletons are fixed in predetermined poses, offering stability but limited flexibility. They are ideal for display or stationary use. Semi-articulated skeletons feature movable joints such as elbows, knees, and neck, allowing for a range of poses while maintaining structural integrity. Fully articulated skeletons provide the highest level of flexibility, with joints that mimic natural human movement, enabling dynamic posing and positioning. The choice depends on your desired interaction level and maintenance preferences. Materials used for skeletons include metal, plastic, or a combination, with metal offering superior strength and longevity. Some advanced dolls incorporate internal frame systems that allow for more lifelike movements and postures. Understanding the differences among these skeleton types helps in selecting a doll that aligns with your expectations for realism, posing options, and longevity.