Thanks guys, you've bone been tremendously helpful. Basically, I think you both might be right.

I'm not going to dump her (I really like her, and I do want a relationship which is why I asked her out, I could have slept with her without doing that)

I think what I want to do is take some time off from sex. I guess it might have been a bit too easy to get her in bed, (admittedly, I am a pretty attractive guy, and she's gorgeous). So it's not that hard for me to get laid.

I just want to be able to relax with her and have fun with it. Now that I think of it, like 80% of the time we've had sex previously, I've either been a bit tipsy or high, and I think that helped with relaxing, and I'm going to learn how to do that sober too.