Squash produces separate male and female flowers. If you don’t have both male and female flowers, you can’t have pollinated flowers for squash production. Female flowers of squash, zucchini, and other cucurbits will have a “mini-fruit” just underneath the flower. That’s the ovary. If it is just a stem, then you have a male flower. Male flowers almost always form first to prepare pollinators for the presence of the squash plant. It’s designed to attract them to the squash plant to improve pollination.