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Let's see...why wouldn't couples in love just get married?
Could it be that:
1) They know it's a lot easier to get married than to get divorced?
2) They don't want to make a till-death-do-us-part promise until they REALLY mean it and are REALLY sure?
3) They happen to be of the same gender, and they don't have the choice?
4) They know that romance is wonderful and all that, but living together day-by-day is a very different thing?
5) They know that their taxes will go up if they get married?
6) There are issues they're still working out in their relationship?
7) There are very few things that married people can do that cohabiting people can't?