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			I think that some men have more of a tendency than women do to join an organization for a specific reason or purpose, such as a club sport team or ROTC, rather than a general-purpose organization such as a sorority or fraternity.
 I've also heard that there's been a marked decline in men's post-college fraternal and community organizations,  ("Bowling Alone", anyone?) so this might be a broader societal issue, rather than a social fraternity-specific one.
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