Biological standard but a culturally shaped and individually variable phenomenon. These findings underscore the need to recognize diversity in beauty ideals and encourage healthier, more inclusive representations of body image. Perceptions of physical attractiveness arise from a complex interaction of biological, psychological, and cultural factors. Among these traits, breast size has received significant attention in both scientific and social contexts. Although larger breasts are often portrayed as attractive in many modern societies, this preference is far from universal. This study examines how evolutionary theories, media exposure, sociocultural norms, and individual experiences shape perceptions of breast size. Evolutionary literature suggests that breast morphology may provide subtle cues related to reproductive maturity or health, but such interpretations remain debated. Psychological processes such as learned associations, symbolic meanings, and past interpersonal experiences also contribute to attraction. Cultural narratives, media representation, and contemporary beauty standards further reinforce preferences, often exaggerating the appeal of larger breast sizes. Using a mixed-methods design, we analyzed quantitative survey data and qualitative interviews from women aged 18–65 across diverse cultural settings. Results show substantial variability in breast size preference: 41% preferred larger breasts, 38% preferred medium sizes, and 21% favored smaller breasts. Media exposure was a significant predictor of preference for larger breasts, whereas evolutionary cues played a comparatively minor role. Qualitative findings highlighted themes related to cultural norms, perceived femininity, confidence, and social desirability.