Erection

Patient: Hi doctor I’m 22 years old and well I’m a rare drinker I had sex with my girlfriend it was awesome I didn’t have any problem but then the next time we had sex I couldn’t believe myself cuz I was able to make intercourse for nearly 45min and after a month we did have sex but we had little drinks I couldn’t last for 10min also is it cuz of over excitement or cuz of drinks my cock was like hard but wen I try to penantrate it goes limb!!!! Is tis a problem?

Doctor: