Hi, I'm a guy who is 18.
Had sex for the first time with my girlfriend a few days ago and it did not turn out as planned. We had lots of foreplay and were ready to do it when just before penetration I lost my erection. We tried again and the same thing happened, the finally about 2 hours later I finally was erect when I entered and we had sex.
The problem is, we tried again yesterday and the same thing happened, although this time it was worse. I didnt get an erection at all and after trying for about 3 hours we gave up and didn't have sex.