The common features of the
full body sex doll, such as a small waist, small feet, and a high waist-to-hip ratio, are physiological markers of puberty rather than peak fertility. When this aesthetic preference becomes ingrained through long-term use, individuals will tend to choose partners with lower fertility but who appear younger in real life. This preference may indirectly affect the fertility rate by delaying childbearing or reducing the desire to have children.