It's the journey, man, not the destination. It's perfectly normal to not come the first several times you have sex, as well as not being able to get it up in the first place. The most important thing is open communication--talking about what you like, her talking about what she likes. Often just talking about it can lead in some interesting directions, so use that as an incentive. And I agree with Abaya--once you get started, stop thinking. It's all about the sense of touch, her smell, her sounds...
