I have been dating a girl for about 5 months now. Before we started dating I had sex on only four different occasions. The 2-3 times we had sex everything would be fine until I put on a condom after which I would lose my erection. I researched and found out that it was most likely due to anxiety and being nervous about having sex. After the first couple times I had no problems for about two months everything was going fine. About two weeks ago I lost and erection in the middle of intercourse and had no idea why but I didn't really think anything of it. The next few times we had sex I kept loosing it and I'm pretty sure it had to do with the fact that I thought about it and assumed it would happen again and it eventually did. After this we continued to have sex and everything was fine, probably the best its ever been, but then again today I lost my erection in the middle of intercourse.

I am extremely attracted to my girlfriend and am easily aroused by her. I feel like there might be something wrong with me more than just anxiety. It almost feels as if I don't have the strength that I used to have in my PC muscles. I've been tested for STD's before and have been clean and she was recently tested and was also clean.

I'm really worried about this because my girlfriend feels as if I'm hiding something from her or that I'm not attracted to her, but that is not the case at all I have nothing to hide and as I said earlier I am very attracted to her. I really would like to know what is wrong with me because I feel that if this continues I'm going to lose my girlfriend please help...