I have a few techniques that I would like to share, and hope to learn more.
A long time ago I was shooting the shit with a buddy of mine and he was bragging about how he could fuck as long as he wanted to. I called him a liar, but he proved to me like this.
He said when your heart rate is out of control and you are out of breath you come. If you keep your breath you can keep fucking.
He was right. I tried it and it worked. I am a little more cerebral about it being A Real Nerd.
I figure it like this. (1) Keep your heart rate down by pacing your physical activity. (No racehorse fucking) and (2) Don't mentally blow it by getting to turned on. (No mindfucking). While I still enjoy the experience sometimes the only way not to come is to imagine like pitching baseball or saggy grandma boobs or something.
Finally if all else fails sometimes I can pinch the base of my cock and stop it from cumming.
So there is my two cents. Any other thoughts?