Not just in relationships but even among co-workers I notice there is a lot more gossip between the biological females and they tend to bring up things like, "Do you remember when so and so did [Insert minor issue from 2 months ago]?"
To repeat this is just my observations from 20 years of office work and a half dozen or so relationships I had before settling down with the current love of my life.
The point of all of this, I feel is that to many people, the epiphany the article is making was quite obvious, although it is neat to see this quantified.