Foreplay. Like Kleclere said. Works wonders.

You are hopefully using condoms to begin with, but if not it will make him last longer. If are are using them and they still don't do the trick, try switching to a different brand that is thicker. Less feeling for him might make him less likely to blow his load so fast. Oh, and don't use two because they will increase the chance of breaking, ruining the whole protection aspect.

If all else fails tape a picture of Drew Carey to your chest, it'll either break his habit of blowing early or scar him for life. Possibly both.

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-Deno