its easy to lose all control when boning, so i'll share some of my secrets, although its prolly not anything you havent heard before...
the most important thing you can do is.... spend an hour on foreplay (if you have knowledge about givin girls head, they love it and will be turned way on)... doing this will take the attention off you bustin early, so give it a try...

or.. if you feel the boiling point approaching, pull out and wait for the moment to pass, then proceed...

or... think about something totally not attractive to you (baseball, rush limbaugh, your dogs balls, whatever...) and chances are, you will prolly lose your "fuck chi" and have to recommit yourself to screwing...

just find something that works, maybe your going to fast or being overcome with ecstacy or whatever...

good luck