It is ironic then that the greatest deterrent to that arrangement is gay marriage. Your hypothetical "hetero buddies" who cohabit to enjoy spousal benefits would be unlikely to go so far as to enter into a homosexual marriage with one another to the exclusion of any lawful union with a woman. It is the informal nature of cohabitation without the full formality of law which permits these alleged arrangements to thrive.
But I digress.
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