All cucumber plants, regardless of variety, produce male and female flowers. The males always fall off and produce no cucumbers. The females are pollinated by the males and eventually fall off. If you have no insects, especially bees, they may not be pollinating. Additionally, if you've experienced a run of really hot weather, the flowers could wither and fall... More watering can help that situation. Cucumbers take a lot of water... at least an inch a week, more's better as long as the soil isn't waterlogged...