The woman's anus is being penetrated by a mechanical actuated dildo (fucking machine). The frequency at the dildo is being actuated at is above the frame rate of the camera creating a frame-rate aliasing effect known at https://en.wikipedia.org/wiki/Wagon-wheel_effect . In reality, this woman's labia and clitoral hood are just actually flailing wildly.
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The woman's anus is being penetrated by a mechanical actuated dildo (fucking machine). The frequency at the dildo is being actuated at is above the frame rate of the camera creating a frame-rate aliasing effect known at https://en.wikipedia.org/wiki/Wagon-wheel_effect . In reality, this woman's labia and clitoral hood are just actually flailing wildly.