After sex leg shaking is a normal physiological phenomenon, generally with sex when the same action for too long, or do some difficult action related, may also be the orgasm caused by muscle cramps. If in the process of intercourse, the sexual behavior is more intense, do some difficult action, or the same position for a long time, it may cause leg muscle tension, there is a slight spasm and other performance. After a little rest after sex, the symptoms will ease on their own. When women are sexually satisfied, they will also show increased muscle excitability and muscle spasms or regular contractions throughout the body, so they will also cause this trembling. If there are no other abnormalities, then you can not worry too much. You should pay attention to a moderate sexual life, adhere to sports and exercise, ensure rest, nutrition and relaxation. If it is also accompanied by symptoms such as abnormal leucorrhea, you should go to the hospital in time to clarify the cause before treatment.