The flower at center of the picture to the right is a female flower.
The flower at bottom left corner is a male flower.
It is very unusual for me to find a male and female pair of flowers.
In the past, I have noticed that the plants will produce only male flowers at the beginning before it starts producing female flowers. When female flowers start to form, there are usually a lot more male flowers than female flowers.
The picture to the right shows the plant in the evening of the same day. See the flowers have already faded.
You can see the tiny fruit at the base of the female flower.
If the bees did their job pollenating the female flower the tiny fruit will grow. If the female flower was not pollenated, then the tiny fruit will fall off in a few days.
Hopefully, bees will bring pollen from the male flower to the female flower and I will have a Kabocha fruit as a result.