Girls often sit cross-legged due to a combination of anatomical and social factors.
Anatomical Differences
The primary reason is anatomical: women typically have wider hips and a greater distance between their legs than men. This wider pelvic structure makes sitting with legs crossed inwards a more comfortable and natural position. As noted in the provided reference, "Women, on the other hand have larger hips and a wider spread between legs so it's easier to have them stick inward". This difference in skeletal structure influences preferred sitting postures.
Social Factors and Learned Behavior
While anatomy plays a significant role, learned behavior also contributes. Societal norms and expectations often influence how women are taught to sit, with crossing legs being presented as a more "ladylike" or refined posture. This learned behavior reinforces the practice. The reference mentions this indirectly: "Women are also taught to cross their legs".
Other Considerations
It's important to note that not all women sit cross-legged, and the preference for different sitting positions varies among individuals, regardless of gender. Other factors, such as personal comfort, clothing, and the surrounding environment, also influence sitting posture.