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 brief and unable to engage in sexual intercourse, 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 an erection, or if your erection is not firm, or if it is firm but brief, making it impossible to engage in sexual intercourse, 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 due to erectile dysfunction or phimosis. If phimosis is present, surgical treatment should be considered as soon as possible.