08/20/2012 10:42 am ET | Updated Aug 21, 2013

WATCH: Why Is Fifty Shades Of Grey So Popular? From Dr. Sue Johnson

Why are so many women drawn to "50 Shades of Grey"? Relationship expert Dr. Sue Johnson weighed in the popularity of this racy novel when she met with me on Mondays with Marlo.

And if you want more relationship advice from Dr. Sue, check out her top tips here:

Relationship Advice From Dr. Sue Johnson

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