You may know how to turn a girl on, but making love is not just about what is done during the making, but also that what is done before, and after. It is important not to take your partner for granted and act in ways that can suck out the charm from the entire act. Check out here, a few things that you must NOT do after the love-making act.
Don't just roll over and go to sleep. Cuddle a little. Make the time that follows special. Talk to your partner, and show some affection.
This should be fairly obvious, because something like this could send a wrong message and hurt your partner.
It does not matter if you were a superman in bed. Saying it, and especially repeatedly saying it, makes you look like crap. A better idea would be to compliment your partner instead. And if you really were that great, then you'd get a compliment back too!
Wait for a while before you prepare to leave, even if you are in a hurry. That'd help you not hurt your partner by any chance.
It's a very common mistake that people do and end up making their partner feeling neglected. Avoid it completely.
Even though you have shared your whole privacy with your partner, there are lines that you mustn't cross. Avoid doing filthy like picking your nose or passing gas!