1, thick buttocks and poor blood circulation. The drug absorption rate of "ass needle" is low, and its effect is very slow after injection, which will affect the injection effect.

2, playing "ass needle" involves privacy. If the opposite is a doctor of the opposite sex, you will inevitably feel embarrassed and would rather choose other roles to play.

3, playing "butt needle" affects activities. If there is edema and induration locally, it will also be infected with suppuration, leading to muscle atrophy.