How quick is too quick?

The old advice to distract yourself with baseball players (or presidents names :P ) is bad advice. Pretty much any literature on the subject will tell you that you need to pay attention to the bodies cues not ignore them. One of the first things you can do is masturbate. While masturbating pay close attention to sensations you are experiencing so you know what your body is telling you when. That way when you're having sex you will know when to slow down, or stop. If you get to the point you know you're about to orgasm stop, pull out, switch positions, go down on her pretty much anything to get yourself back under controll.