It's because males are considered to be the socially dominant gender. It's the same reason white people can't have "whites only" clubs. When you think about it, it's a bit silly since the very concept of considering them to be the dominant gender or ethnicity (true or not) immediately bolsters that groups position of social power and prevents true equality.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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