What should I do if a large amount of semen flows out of the vagina after ejaculation?

Patient's question:

Patient Age: 22
First Follow-up Question: The issue is that after he ejaculates, air comes out from my vagina shortly afterward, and all of his semen flows out in large amounts instead of a small amount. I know that a small amount is normal, but I feel like it's all coming out? What should I do? Who can help me understand this?

Doctor's answer:

This is a common phenomenon. It contains hundreds of millions of sperm, but only a very small number can pass through the cervix and the uterine cavity to reach the fallopian tubes for fertilization. Generally, only 15-50 sperm can do so, and rarely more than 200. The majority of the remaining sperm are rejected and are expelled from the vagina along with the semen.
To prevent semen leakage and increase the chances of conception, the woman's hips can be elevated during intercourse, and she should lie flat for two hours afterward to ensure the semen covers the cervix and reduces leakage. As for the excess semen expelled from the vagina after intercourse, this is a natural phenomenon and generally has no impact on fertility.