only male flowers

All the squashes and pumkin varieties I have are now fruiting away, except for my butternut. This has masses of gorgeous leaves, a long tail of about 2m  and plenty of male flowers. No females as yet.

Any one any ideas as to why, or anything I can do to encourage it in the right direction, please?

Don't panic, my butternut are always late developers. In fact I'm sure they do it on purpose, they deliberately wait until I think they're not going to make it before the frosts then woooooooooooooooooooooooooooosh!

dont worrie just wait they might be a bit late my pumpkins last year were all males and then i was supprised to find 1 pumpkin =]
This year there doing fine iv got 4 giant atlantic pumpkin plants growing and they all have about 4 massive pumpkins on them
Not bragging and all

Let's hope the joke's over soon , as I love butternuts and was am looking forward to a feast or two (Let's be positive!)

Maybe they'll hear your encouragement. Thank you everyone 

Save some of the male flowers, otherwise it will pull a fast one and have all female next. My squash are currently alternating, a few days of one and then a few of the other 

Doesn't the pollen die?