Check out the 4th post. This is what I tried to do on one vine. Haven't seen a female flower yet though.
Pollination of Cucumbers - Hydroponics Forum - GardenWeb

This one also says to pinch off male flowers for indoor cukes. BBC - Gardening - Basics - Growing cucumbers

I'm wondering if this is more related to all female hybrid types of cucumbers though, because in my mind male pollen will still be necessary to pollinate our female flowers once/if they bloom.