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 or maintaining an erection, or if your erection is firm but short-lasting, making it impossible to engage in sexual intercourse, this may be a symptom of erectile dysfunction. The conditions mentioned 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 excessive prepuce. If the prepuce is excessively long, surgical treatment should be considered as early as possible.