I don't think I could last all night either. But like Grumpy, I've got a good tongue. And I could always bring a boxload of batteries and a vibrator (or two) to keep things going as long as possible.
Watching (and helping) a woman cum is fun too. If I am not trying to cum myself, I can concentrate more and enjoy seeing a woman loose control.
Sometimes I even like to sit back and watch a woman masturbate.
It is all good stuff. I could easily do a nightfull of different types of sex.