A sex doll (also, joy toy, love doll, fuck doll or blowup doll) is an anthropomorphic sex toy in the size and shape of a sexual partner. The sex doll may consist of an entire body, or just a head, pelvis, or other body part (vagina, anus, mouth, penis, breasts) intended for sexual stimulation. Sex dolls are made from various materials like silicone, TPE (thermoplastic elastomer), or rubber to replicate a lifelike feel. These materials are chosen for their durability and realistic texture, enhancing the overall experience for users. The parts sometimes vibrate and may be moveable and interchangeable. Sex dolls exist in many forms, but are usually distinguished from sex robots, which are anthropomorphic creations designed to be able to engage in more complex interactions.[citation needed]