They certainly can; it is not illegal. Be aware that, by nature, there will be a drastic size of female population paired against the minuscule percentage of males.
Having said that... once you are out of high-school, you may find more teams looking for a certain gender (or both, in some cases)-- it will depend on the severity and official'ity of the particular group.
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yes there are!
you can have mixed teams of girls and boys or you can have a boys team.
Only if it is not high school, Jr. High, and down, Collage Ball. But after that both sexes can.