My girlfriend and I (a virgin) decided to have sex for the first time several days ago. Before this point I had no trouble attaining and maintaining an erection, and could ejaculate upwards of ten times per day.

However, after putting on the condom, I lost my erection, we tried again the next day and i couldnt even get erect without a condom. Over the last 3 days I've not even been able to masturbate to porn.

I was wondering what might be causing this problem, and how it could be solved?

Thanks
-JD