They are quite effective for grouping and referral purposes.
They tend to group together women of certain personality types and goal orientation. This helps the male of the species to efficiently qualify likely targets for fornication.
The female of the species is benefited in that she doesn't have to personally sleep with every male on campus to separate the subpar, average, and above average lovers, she can simply look to her sisters for referrals while occasionnally taking one for the team.
At least that is my understanding of the situation.
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