If you want to determine whether the flowers are male or female, you can tell by peeking inside the flower petals and looking for the male (stamen) or female (pistil) reproductive organs. You can look up how to distinguish this on a basic botany website.

Keep in mind that pumpkins are monoecious, meaning flowers are either "girls" or "boys", but both sexes of flowers are found on the same plant. So some pumpkin flowers have only female parts in them, and other pumpkin flowers on the same plant have only male parts in them, as the previous poster implied. Other species of plants (not pumpkins) are "perfect", meaning stamens and pistils are found in the same flower. And still others are dioecious, meaning one tree over here has only all male flowers, and another tree (of the same species) over there has only female flowers.

Seedplanter, I think its safe to say we all know they are called PUMPkins.... some people like have little fun with their posts.... lighten up!