Loss of Courgette flowers

Hi
I have grown courgettes for the first time this year in a pot ( thanks to Johns book) and it was doing really well with loads of flowers. Suddenly 5 of them just dropped off. Is this due to lack of water. Am worried I am over watering as its constantly wet, especially since the flowers keeled over and died! Any thoughts 
thanks Anne

Cleraly I'm a novice here  . How do I know the difference

sorry to butt in! do you have to pull the male flowers off then?!

Thanks for that. Clearly most of my flowers are male. I have another courgette in the process of developing but thats about it. I presume its luck of the draw and there is nothing i can do to affect the sex off the flowers
then

i see! sounds about right do there job then drop off.....

The flowers need to be pollinated, if they are not they will drop off. This is normal early in the season until pollination insects make themselves busy.

There are now a couple of courgette varieties that do not need pollination to set fruit.
Parthenon F1 and Cavili F1. These two have a “parthenocarpic” habit, which means that they are claimed to be able to set fruit without pollination. This would be useful if you are growing under cloche protection or in a greenhouse.
I have grown Cavili outside this year and it was the first of three varieties to produce courgettes. It does produce male flowers but the females seem to set first time.