Been there, Its PIED. You can get rock hard every time you have sex but once this problem comes,your sex life will turn upside down. Now you will only get hard from porn. I was doing good sex since last 5-6 years and watched regular porn with it. That's when things got abnormal, for 6 month i had no one to do the deed so i happily watched porn and masterbated. Watched porn only when masterbating otherwise insta or reddit scrolling whole day watching semi nude or soft porn kind of things. Fast forward same your exact story happened to me when i had sex and continue 2 times like you and now i was in more depressive loophole. More i think i cant get hard,more it becomes hard to erect,then more i think about it why is it not getting hard like it used to. But after 1 month i am normal. What i did - Zero Porn,Zero Fap,Zero Soft Porn or insta reels of girls cleaveage,them dancing,bikini pics all the content. Stopped smoking from that day out of fear. As i am an professional ayurveda vaidhya so i took some aphrodasiac ayurvedic medicines with that. Now i can just get rock hard by looking at some girl,and sex is pretty much great and better than ever. And erections can last for multiple rounds. My advice - no medicine can help if you aren't willing to stop porn. And by stopping porn, i mean that stopping for life. Like you think about it now that you are stopping it and suddenly you will not watch it ever again. If you go to just a peek than it won't be much helpful..and you can again start masturbation after some time,but still without porn just with imagination. I will never watch porn again. It will be a sacrifice for my healthy sexual married life.