I am a 21 year old guy and I am a virgin. So is my girlfriend. We wanted to wait until we were 21. We were planing on having sex for the first time last week. The night we tried it, I was very aroused and hard right up until it was time for me to enter her. As soon as I was ready to go in, I lost my erection. Realizing that we couldn't complete the act, we gave each other manual orgasms. (As soon as that started, I got very erect again). Every time we try to have sex I have the same problem. I am hard right before, I can get hard right after, but not when it counts. What can I do to avoid this? Should I drink a little alcohol before to loosen up? Take pills? Any advice will be helpful.