2. She Asks if "That's it?"
Okay, she probably isn't going to ask you that, but if it lasted less than ten minutes, you know she's thinking it. Trust us, there are many dudes out there who blow their top, err, flip their lid—fuck it—a lot of guys come too quickly. Sometimes it happens, and there's not much you can do about it.
If you're one of those guys, maybe you should focus on quality foreplay beforehand, or make like Austin Powers and think about "Margaret Thatcher naked on a cold day" or "baseball." Keep the party going long enough for her to enjoy herself, and if you can't, make sure you help her get off, too. She'll be more forgiving that way.