It is a slippery slope. Once you define marriage as a union of people who “love each other” , it opens the door to anything. Already we’re beginning to hear calls to legalize polygamy. That has more historical precedent than homosexual unions. But, now that we’ve kicked open the door, what’s to stop it.
Once you define marriage as a union of people who “love each other”
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Pretty soon it will be defined as a union of animate objects who like each other.