Consumer psychology research has found that the weight selection of the full body sex doll is closely related to emotional needs. Among users who choose heavy fat sex dolls, 68% regard them as a carrier of emotional sustenance, and the sense of reality brought by the weight can relieve loneliness and anxiety. The group that prefers lightweight models pays more attention to the practicality of the product, and its repurchase rate is 29% higher than the former. Psychotherapists point out that the fat sex doll weighing about 38 kilograms achieve the best balance between security and controllability, and are particularly suitable for adult men who are first exposed to such products.