I read this whole ebook once about this. It didn't help me at the time.
I think the key is this:
Normaly you just keep going or even go harder and faster when you are going to come. This won't work.
You can't just go and right before you come, stop and clamp down.
You have to slow down when you feel like you are close. Then instead of pushing yourself over the top quickly, do it slowly and see if you can just barely come. That may not make any sense.
Honestly, I haven't had sex in the few weeks since I learned to hold it; I think you need to make the orgasm less intense because I know sometimes it's just over the top!
