I am fairly certain that you can also treat the plant with a hormone that prevents seeds forming.

The flower MUST be pollinated to set fruit at all, but the fruit simply is a vessel for the seeds to develop within... if you can prevent the development of the seeds without preventing the development of the FRUIT, you're in business.

That 'Reverse' product from Dutch Masters I think can be used on curcubits to give seedless fruit.

Johneg, would you mind citing a reference for that information?