Which argument supports the idea that cohabitation is a "trial phase" before marriage?

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Cohabitation is often seen as a "trial phase" before marriage, primarily because it is a way for partners who have never been married to experience living together and understand the dynamics of a shared life before legally binding themselves through marriage. This choice suggests that cohabitation is a step taken by those who are exploring the possibility of marriage for the first time.

Which Argument Supports the Idea That Cohabitation Is a "Trial