I've had intercourse with my girlfriend on one occation, at the point we were both virgins (though I were more experienced than her, I'd never had intercourse before). I was very afraid of loosing my erection, it had happened at another time (I was not concerned about it then, it just happened, first time and nervous as heck. Another girl, several years ago). It went smooth. Afterward I was the happiest guy on the block, I care very much for my girlfriend and I was glad to have done this.
When I saw her next time, (we live far away from each other due to studies) It got problematic, not for me initially but she found it painful. After that I developed a "stage freight". I've had like 3-4 encounters where I loose my erection at the point before entry (everything else is okay) and we haven't had it since that first time.
I'm seeing her in a week and you have no IDEA how much I'd appreciate any response. Please no flame messages, I don't know anywhere else to ask.
It seems that I've unintentionally have made a negative anchor. I get very focused on my "task" and then loose it. There's absolutly no physical aspect to it, it's mental.