Sore back after sex, this indicates that the frequency of sex is high, or sex lasts too long, resulting in pain and soreness in the lumbar muscles. It is recommended that in this case, you should pay proper attention to rest and reduce the number of sexual intercourse, which can gradually relieve the soreness of the waist. Sex, first of all, is a relatively strenuous exercise, many male patients after sexual intercourse will have soreness and pain in the lower back, indicating a high frequency of sexual life. A sexual life, equivalent to 2000 meters of jogging exercise, so the appearance of lumbar soreness after sexual intercourse, indicating that the body has exceeded the load, should control the number of times and time of sexual intercourse.