Why does it get soft right after entering during sex with your girlfriend when it was originally hard?

Patient's question:

Patient Gender: Female
Patient Age: 27
Hello, if you have difficulty achieving or maintaining an erection, or if your erection is firm but brief, making sexual intercourse impossible, this may be a symptom of erectile dysfunction. The conditions described above fall under the category of erectile dysfunction. It is recommended that you visit a hospital to rule out whether it is indeed erectile dysfunction or phimosis.

Doctor's answer:

Hello, if you have difficulty achieving or maintaining an erection, or if your erection is firm but brief, making sexual intercourse impossible, this may be a symptom of erectile dysfunction. The above conditions fall under the category of erectile dysfunction. It is recommended that you visit a hospital to rule out whether it is caused by erectile dysfunction or phimosis. If phimosis is present, surgical treatment should be considered as soon as possible.