I've had this happen to me 4-5 years ago with this HB I thought at the time was a 10. She was smokin hot and I was so damn worried about pleasing her that I didn't even think about how good it felt for me. She got on top, I got nervous, and couldn't get hard. It ruined the moment because she thought it was her fault. I eventually got hard and tore it up but that was the one and only time I got to fuck her.

(tear) So what helps me, is to just think about how good that pussy is going to feel. Focus on what you feel 25% more than everything else during sex. Another thing I did that helped that I got from Ross Jeffries' Unstoppable Confidence Audio Cd's: In your mind, replay that movie in 3rd person, of you fucking up with that chick but this time do what you really wanted to do. See/feel/hear yourself doing it right. After you do this maybe a couple times, it seems like you never fucked up in the first place. It erases those bad memories and emotions tied to them, pretty much reprogramming yourself.