What to eat after coitus does not promote fertilization, and food does not play an obvious role in helping fertilization. Whether or not successful fertilization after intercourse is mainly related to the physical condition of the woman and the quality of the man’s sperm, for example, whether or not the woman has a regular menstrual cycle and ovulation, the development of the uterine lining, the smoothness of the fallopian tubes, and the quality of the man’s sperm, etc. has a fairly important relationship. There is no need to take anything to improve fertilization after intercourse; food plays no significant role in helping fertilization. If pregnancy is planned, it is recommended to have intercourse during the woman’s ovulation period and have blood drawn 10 days after intercourse to check for human chorionic gonadotropin and to clarify whether or not pregnancy has occurred. If the couple finds it difficult to conceive, or if the woman has ovulation disorders or abnormal follicular development, it is recommended to follow the doctor’s instructions for active treatment according to the cause of the disease. If a woman has been living regularly without contraception for one year without getting pregnant, it is recommended that she go to the hospital to find out the cause of the problem and get timely treatment.