A study published in Scientific Reports found that heterosexual women report greater jealousy when imagining women with more feminine faces flirting with their romantic partner. This pattern was also present in lesbian participants, though the strength of the association was significantly weaker. Facial femininity is the degree to which a person’s facial features display traits that are typically associated with female faces. These traits include larger eyes, fuller lips, a smaller jaw and chin, higher eyebrows, and smoother facial contours. Facial femininity is influenced by biological factors such as sex hormones, especially estrogen, during development. Researchers most often study facial femininity in the context of evolutionary psychology and social perception. In general, women with feminine faces tend to be perceived as more attractive, more youthful, and healthier. Studies have also indicated that facial femininity can influence social judgments—women with highly feminine faces tend to be perceived as warmer, kinder, and more trustworthy. Study author Junzhi Dong and his colleagues note that evolutionary theory suggests individuals displaying cues of higher “mate value” (e.g., those who are …