I have an interesting method.
Usually, when it happens to me, it's just because it's been a while and I'm so amped up, there's nothing that can stop it.
So, when faced with lemons, make lemonade I say.
The upside to this is that I'm usually so wired I can go 2-3 times, each time taking quite a bit longer than the last.
My personal record, when I was much younger, was a porn enhanced 6 times in a span of about 6 hours. My GF of the time (now my wife) fell asleep after my third trip to O-town. I wasn't tired and had a few more movies to watch.