Investigating Lip Attractiveness

Lips significantly affect the perception of an individual’s appearance and age. With recent shifts in social focus, lips have garnered increased attention. However, the morphological factors contributing to lip attractiveness and the underlying biological factors remain unclear. Therefore, this study explored the factors associated with the color and shape of lips. Furthermore, we assessed how each factor influences lip attractiveness through sensory evaluation and investigated the biological factors related to this. Our findings suggest that lip attractiveness is correlated with color, moisture, volume, and wrinkles, and that these traits vary according to gender. Men focus on color and moisture, while women focus on color, moisture and volume. Color is influenced by blood flow and velocity to the lips, and hemoglobin oxygen saturation; moisture is linked with lip surface pH; volume correlates with the structure of the dermal papilla; and wrinkles are associated with lip surface temperature.