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Gender disparities in participation in many STEM fields, particularly computer science, engineering, and physics, remain prevalent in Western societies. Stewart-Williams and Halsey contend that an important contributor to these disparities is gender differences in career-related preferences that are driven partly by biology. We argue that Stewart-Williams and Halsey understate the influence of cultural factors in shaping these preferences. We provide evidence for an important and overlooked cultural factor that contributes to gender disparities in computer science, engineering, and physics: masculine defaults. Masculine defaults exist when cultures value and reward traits and characteristics associated with the male gender role and see them as standard ( Cheryan & Markus, 2020 ). We provide examples of how changing computer science, engineering, and physics cultures can decrease gender disparities in participation. Finally, we discuss policy implications, specifically the importance of (1) recognizing that preferences for STEM are malleable and (2) addressing exclusionary cultures of STEM fields. Recognizing and changing exclusionary STEM cultures are important for creating a society that is more just and equitable.