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The female pelvis is flatter, more rounded and proportioanlly larger to assist childbirth. The sacrum also shorter, wider and projected more posteriorly for similar reasons. It is thought that the female waist-hip ratio contributes to hip sway when walking in order to balance the weight. It has also been suggested that when a woman is most fertile (ovulating), her hip movements become slightly more exaggerated in order to attract additional attention.

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8y ago
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10y ago

Men's butts also have fat that causes it to shake a bit when they walk, you probably just don't realize it.

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Q: Why does a woman's butt shake when she walks?
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