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Why do you want an injection and spanking? What is the principle?
It is because hip muscles are rich and nerves are few, so it is not easy to hurt nerves.

There are many nerves around the buttocks. In order to avoid nerve injury, the needles in the buttocks are all in the upper part of the unilateral buttocks (1/4), and the muscle tissue of the buttocks is very thick. First, it can avoid bone injury, and second, muscle tissue is loose, which is beneficial to drug absorption.