Firstly you need to know the difference between the sexes. The male flowers come first, are more numerous and have a long thin stork below the flower.
The females generally flower later to make sure there are many males available for mating with. Below the flower you'll see a voluptuous mini pumpkin fruit like this.
We rip off a good looking male and tear off the flower petals to expose the stamen, with pollen. The pollen is ready if it comes off the stamen easily in your finger.
The female will only be receptive to pollination for a day or so, so you need to keep an eye out for females flowers. The best time for sex is in the morning (as we all know), so get up nice and early to do this. The next step is just to push the stamen into the female flower's central area (the stigma).
The end result looks something like this.
You just can't have too much pumpkin stored for winter baking and soup, so get out there and do some pumpkin sex. I'm sure you'll enjoy it just like we do...