Why does research suggest caution with regard to cohabitation?

Question

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Research suggests that cohabitators who eventually marry have a higher rate of divorce compared to those who did not cohabit before marriage. This is believed to be due to factors such as a lack of commitment, a mindset of "testing" the relationship, and a tendency to view divorce as an easier option if problems arise. It is important to note, however, that this association may not be causal and that there are many factors that can influence the success or failure of a marriage, regardless of whether or not the couple cohabitated prior to marriage.

Why Does Research Suggest Caution with Regard to Cohabitation