Have you found out what she likes, what turns her on? All women have a vagina and a pair of tits, but have you got any idea what makes those tits hard and that pussy wet? I bet you'll say that your technique is flawless and it knocks her off her feet, but is that true? I've asked my girlfriend once how did I do and she said that at one point I was pulling too hard on her hair, that I thrust too hard and her nipples are raw. And I thought I've sent her for a short trip through Heaven...
Don't get "too cocky"
It's one thing to be confident and have a great self esteem, but another to be cocky. When you reach that point where you're cocky, you might not notice some details in your performance and her response to your stimulation. You might do the same thing every time and get her bored with the same 2 positions over and over. Even if you're not very comfortable in other positions, give them a try, vary them and pay much attention to the response you get from her- that's the most important thing.
Here's something they all like and what we, men, like as well. We all want to be admired and we definitely like when we get someone's attention. Gaze and admire her body. Actually take 2 minutes of your time during foreplay admiring her body. Just slide your fingers gently up and down her body with a craving (but not drawling or libidinous) look in your eyes. Make her feel wanted!! Actually do this and after those two minutes ask her to dance for you (if she's naked) or undress slowly (in case there are any clothing items left on her). You'll both be aroused - it's a win-win situation. And trust me, I know what a pain in the ass is to get her in the mood when you just want to stick your cock inside her and show her who's boss.
Surprise her and surprise yourself
Take her in your kitchen as she just went in to get a glass of water. Just go in there, in te middle of the afternoon, out of the blue, kiss her, touch her as you know best, slowly undress her and surprise her with a great sex encounter on the kitchen floor or on the table. Make sure you mess her hair and clothes to make it unbelievably wild.
Alone in the park? Have you spotted a dark spot where you might be able to hide, but see everything is going on around? Suggest it to her (but do not force her) and feel how both your hearts rush and how adrenaline fills every part of your body. This might turn into the greatest sex encounter you both ever had and you might actually get to the point where you just remind her about it and make her drag you into bed.
Taste each other's fluids
Every average Joe's dream and fantasy is her swallowing and tasting his sperm... and be honest now, isn't yours too? Don't you want to see her enjoying herself with some of your semen? Well... I bet she'd love it if you tasted her. Love fluids are a turn on to many and if you are open to this idea, this might be a great experience for the both of you.