Update: I am getting a lot better with the fuckers lol. Not 100% success but its not as much of an issue now. I think the main thing for me was getting over the anxiety issues. The girl in question has been my first regular sexual partner so I am a lot more comfortable in sexual situations now. I even used my Paul McKenna Instant Confidence CD (I owe a lot to that CD, highly recommend people give it a try).

The advice on this thread helped a lot too, much appreciated!