What is it about breasts that heterosexual men find attractive? From one perspective of evolutionary psychology, the fat reserves of breasts represent material prosperity. So it follows that men who lack resource security (meaning that they're poor) are more likely to find larger breasts attractive compared to men who are wealthier.
This led psychological researchers Viren Swami and Martin J. Tovée to conduct studies about how men at varying levels of socioeconomic prosperity and varying levels of hunger rated the attractiveness of women with varying breast sizes. From the abstract to their 2013 journal article:
In Study 1, 266 men from three sites in Malaysia varying in relative socioeconomic status (high to low) rated a series of animated figures varying in breast size for physical attractiveness. Results showed that men from the low socioeconomic context rated larger breasts as more attractive than did men from the medium socioeconomic context, who in turn perceived larger breasts as attractive than men from a high socioeconomic context. Study 2 compared the breast size judgements of 66 hungry versus 58 satiated men within the same environmental context in Britain. Results showed that hungry men rated larger breasts as significantly more attractive than satiated men. Taken together, these studies provide evidence that resource security impacts upon men's attractiveness ratings based on women's breast size.
Swami, Viren, and Martin J. Tovée. “Resource Security Impacts Men’s Female Breast Size Preferences.” PLoS ONE, vol. 8, no. 3, Mar. 2013, pp. 1–7. Academic Search Complete, doi:10.1371/journal.pone.0057623.
Photo: Brian Solis