What can girls do to ensure that guys cannot exploit them as a group?

Most guys will do anything to bang a girl for free, or to have an affair they can call off anytime. Girls are making it easier for these guys by bitching about each other, stealing boyfriend of their best friends, and so on. Just why is it so difficult for girls to side by other girls rather than have guys take benefit of us for free? Is it so wrong for a girl to ask for a committed and faithful guy?

What can girls do to ensure that guys cannot exploit them as a group?
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