Three-way marriages in the Netherlands

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According to the Brussels Journal, polygamy has been legalized in the Netherlands and Belgium in all but name. Last Friday saw the first wedding of three people, a man and two women. However, the Netherlands recently confirmed its three—day waiting period for a divorce, so that if anyone should change his, her, or their minds, their "marriage" will not become too freighted with longterm responsibilities. 

Why raises the question: Why bother?