I'm no expert, but I know that some of tantra involves breathing exercises, as well as Qi Gong.
I've always relied on the 'nuns and dead kittens' method. Works for me.
Thankfully, I've grown out of that childish phase where I felt like I had to go 4 hours straight before allowing myself to go. Women like to feel that they're doing a good job too, and when you keep pounding away mercilessly two things will go through their minds, in this order:
"Why the hell isn't this guy cumming? Am I loose? Doesn't he think I'm sexy?"
followed by:
"This is starting to get really uncomfortable. Hurry the fuck UP, jackrabbit slim!"
Quality over quantity, kids, so long as the quantity is sufficient.