Sperm in the body of the general survival of 24 hours, of course, there are relatively long survival time, there are also said to survive 2-3 days. So try to arrange in the ovulation period coitus, if there is a fertilization plan to choose the day of ovulation or ovulation coitus, this is in view of the sperm and egg survival time and the chances of fertilization relatively speaking. In the body actually through the vagina to reach the uterine cavity and through the cervical canal, sperm will be eliminated a large number of, and after reaching the uterine cavity and gradually eliminated, and finally a very small number of sperm will go through the fallopian tubes to reach the tubal jugular, where waiting for the egg and the egg to meet to form a fertilized egg, so there are only a small number of sperm to have the opportunity to survive and conceive.