Arched back
From Voyeurweb's Wiki about Sex
Arched back means that her backbone is arched which is usually done to pose more sexy. Depending on her body position, bending her back leads to elevation of her tits or her ass or both of them. When arching the back in a Wfi-position, her back appears like a saddle and exposes her ass. The more flexible she is, the more she can bend her back. Women able to perform extreme arching, are called flexible girls.
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