Two things come (no pun intended) to my mind from this discussion. There's the physical aspect and the mental one. Physically the body responds to external stimulation of the glans in particular (and the clit for females.)That is why masturbation prolongs stamina, because it decreases the sensitivity of the glans. So a short period of abstinence may help.(what did I just say abstain? Hoo boy...) Then there's the mental aspects, Much more complicated since there are as many different triggers as there are people. But in basic terms, what turns you on about this (or any other girl?) When you know what it is you like, you can focus your mind on those qualities. For example, are you a visual person, do you need to have the lights on? Are you aural, do you get off on hearing the sounds she makes? Of course there's touch taste, smell (lets not go there...) etc.
Often it is a combination of these. Sometimes it may be one or the other. Don't however make sex too "technical". If your too focused on your performance then you won't enjoy yourself. Concentrate on her reactions to you, but don't forget to savor the exprience yourself. Let your mind wander, don't worry about whether your doing things right, she'll let you know when you are. Then just fantasize, better yet, share your fantasies with each other and act them out. It can really make the whole experience a lot of fun. As a last resort, assuming you don't mastubate too much, talk to your doctor. While I'm not personally aware of any products out there, its possible you could use some type topical cream to increase sensitivity.
Often it is a combination of these. Sometimes it may be one or the other. Don't however make sex too "technical". If your too focused on your performance then you won't enjoy yourself. Concentrate on her reactions to you, but don't forget to savor the exprience yourself. Let your mind wander, don't worry about whether your doing things right, she'll let you know when you are. Then just fantasize, better yet, share your fantasies with each other and act them out. It can really make the whole experience a lot of fun. As a last resort, assuming you don't mastubate too much, talk to your doctor. While I'm not personally aware of any products out there, its possible you could use some type topical cream to increase sensitivity.