If you want your sex sessions to last longer, don't let her reach orgasm so quickly the first time around. When she gets real close, stop for a few seconds to let her come down a bit then start again. It would help if you know her well enough to know when she's close, if not then have her tell you when she's close. You can do this for as long as you like, but realized that each time she gets real close the time to get there will get shorter and shorter. You are actually doing a reverse edging where instead of stopping when you are close, you stop when she is close. The first time i do this to any woman, they usually feel a little disappointed 'til you start again. Continue to do this until she begs you to let her cum. When you actually do make her cum, she will go thru the roof. I love doing this to my wife and when i finally let her go, she sometimes sees stars and feels faint right after.