Sex dolls Lily Suck are fetish toys that simulate the appearance and sensation of a sexual partner for aid in masturbation. They can be life-sized, and are often made of silicone or TPE. The most realistic sex dolls are almost lifelike, with facial features that look like a real face and body, and may be anatomically correct. Some sex dolls, particularly those that lean into fantasy rather than reality, are not quite as lifelike but still count as dolls. Some begin to drift into the realm of robots, with rudimentary integrated AI systems and pre-recorded vocal responses to pleasure.

While sex doll owners are generally secretive about their hobby, research shows that many of them have a deep emotional connection to the dolls they own and use them for masturbation or sexual gratification. Some even find their dolls comforting companions and say that they feel a strong kinship with them. According to a recent study by Angelie Ignacio and Gerald C. Cupchik, the connection between a collector and their doll is more about what the doll symbolizes to them than the physical characteristics of the doll.

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Some of the implicit theories that have been found in sex doll ownership include sexual entitlement (the belief that men should be able to use women as they please), the view that male sexual arousal should always lead to orgasm, and a perception that women are dangerous or unknowable. The authors of the study conclude that a testable model for a link between doll ownership and sexual aggression is needed.