Sperm more than 72 hours generally can not be fertilized. Under normal body temperature, sperm can survive in the vagina for 48 to 72 hours, usually not more than 72 hours, if the sperm has not entered the woman’s body, it can survive for 30 to 60 minutes, the woman’s vaginal pH imbalance or the woman’s vagina is too acidic, the sperm can only survive in the woman’s vagina for about six hours. After 72 hours, the sperm has basically lost its ability to fertilize and usually does not result in pregnancy. Sperm can not be fertilized after 72 hours, if any abnormal phenomenon, it is recommended to go to the hospital timely consultation, under the guidance of the doctor standardized treatment.