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This is “more normal” than gay marriage is. If gay marriage is okay than anything goes.
“But if love and mutual consent become the definition of what the boundaries of marriage are, can we as a society any longer even define marriage coherently?”
Precisely. That is the end game. “Gay” marriage destroys the definition of marriage. It becomes a meaningless term, simply a way for people to step through bureaucratic hoops to get certain privileges from the state, having nothing to do with the structure or stability of society.