Try this
http://www.handjobcafe.com/orgasm.php
There are a bunch of ways to last longer. However I find that it helps to really understand your orgasm and ejaculation in order to do this. Men are often so gung ho to cum, that you forget to slow down and enjoy each subtle sensation. Plenty of info on that site that might help you out. Also having a sex toy might help in the sense that you can practice with something that feels closer to a pussy than your hand.