Pregnancy is a delicate process that requires the coordination of various organs, and changes in any one of these factors can affect the chances of conception. The position of intercourse can affect the chances of conception to some extent, but this effect is very small and even negligible. Therefore, the woman-on-man position has no significant effect on conception. The female uterus can be divided into anterior, horizontal and posterior uterine positions. The anterior uterus is the most common of these positions. The anterior position is also the most fertile state. The posterior uterus is the position of the uterus that is relatively difficult to conceive. For women with a posterior uterus, if they have sex in a woman-on-man position, the uterus can be kept in an anterior position for a short period of time due to gravity. In this case, conception can be facilitated. But the effect is minimal. If a woman has difficulty conceiving, there are many reasons why conception is difficult. Patients can consult a local hospital for relevant laboratory tests to determine the cause of the difficulty in conception and take treatment according to the cause. As mentioned above, sex in the woman-on-man position has no significant effect on the chance of conception. For women who have difficulty conceiving, it is recommended that they seek medical consultation to identify the cause of infertility.