My parents' marriage was very rocky. They were always arguing. When they split up when I was in my 20s my brother and I were both delighted because we knew they weren't good for each other.
Civil union is less than marriage. Marriage is a sacred and valued institution and ought to be afforded equal protection.
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Of course the simple explanation of the fact is that marriage is the most important act of man's life in Europe or America and that everything depends upon it.