In the adult doll market, flat chested sex dolls have gradually emerged and gained many fans. The reasons for their popularity include aesthetics, functionality, cost-effectiveness and other aspects. ​ From an aesthetic point of view, modern aesthetic concepts are becoming increasingly diverse, and not everyone prefers traditional plump figures. Some users believe that the simple lines of flat-chested sex dolls have a unique charm, which conforms to their pursuit of natural and casual beauty....