Soreness at the root of the thigh after intercourse with your wife is considered to be related to factors such as overwork and muscle spasm. If men keep the same position during intercourse and keep it for a long time, it will easily lead to poor local blood circulation, and in severe cases, cause muscle spasm. Muscle spasm will make the local muscles, fascia and other soft tissues produce a large amount of lactic acid, thus causing thigh root soreness, usually after resting the symptoms can be gradually relieved. For both men and women, before and after sex to do a good job of cleaning, if there is no childbearing requirements, it is recommended that they do a good job of contraception, to avoid the occurrence of unwanted pregnancy. If a man has thigh pain and discomfort after sex, and the symptoms continue to be unrelieved, it is recommended that he go to a regular hospital, complete the ultrasound, MRI and other related examinations, to determine the cause of the disease under the guidance of the doctor and active treatment.