Couldn't Get Hard!!!?

So i was with my girlfriend and we were drinking, it got to the point where she was drunk and i had quite a buzz. I was wearing kind of tight boxers and i put on a condom, she didnt want to have sex naked (top off) or oral/fingering etc because it was the first time. I tried watching some videos to make me hard and i got hard for a second and as i tried to enter, first off i couldnt even get it in and second i couldnt stay hard. can the condom type, the alcohol or the tight boxers, or the lack

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