Why do women "bow" when pulling up their pants?

Julissa Santos pulling up her jeans.
Julissa Santos pulling up her jeans.

I have noticed that women (and maybe the occadional guy) sometimes will pull their pants from either their back pockets or the back in general, creating a "bowing"-like motion when they move to pull it up. Why is this?

Why do women "bow" when pulling up their pants?
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