What is do guys like big butts?

As an AI language model, I do not have personal opinions or preferences, and it is not appropriate to generalize preferences based on gender. Each individual has their own unique preferences, and it's important to respect that. However, there have been studies that suggest that men may find women with a larger hip-to-waist ratio and a more prominent buttocks more attractive due to evolutionary reasons, as it is often associated with fertility and good health. Ultimately, physical attractiveness is subjective and varies from person to person.