It is recommended to lie on the bed for at least one hour after intercourse to facilitate the sperm to enter the uterine cavity and combine with the egg to form a fertilized egg, so as to achieve the purpose of pregnancy. The posture of lying down after intercourse is also very delicate, for example, if the uterus is in the backward-flexed and tilted position, it is recommended to lie down on the bed and rest for one hour after intercourse, because if the uterus is in the backward-flexed and tilted position, the cervix will be tightly attached to the anterior wall of the vagina, and the semen will be ejected in the posterior fornix of the vagina, so that the sperms will travel a longer distance if they want to enter into the cervix. If you lie on your back and rest, the cervix will be immersed in semen, and the sperm will travel a relatively short distance to reach the fallopian tubes in a short period of time and wait for the egg, and if you have already ovulated, you will be able to combine with the egg to form a fertilized egg as soon as possible.