Why Some Couples Differ so Much in their Physical Attractiveness

A recent article titled “This Is Why Some Couples Differ so Much in their Physical Attractiveness” included the statements “Partners who get to know each other over time tend to differ more in physical attractiveness, a recent study finds. In contrast, couples who get involved with each other soon after meeting are often much close[r] in physical attractiveness.”

This conclusion may lead one to wonder:

What is the average statistical relationship between (X) how long two people have known each other before they become a couple, and (Y) the resultant change in the extent of the difference in their physical attractiveness?

For example, which of the following graph lines A or B (or some other) in the graph below would you assume or speculate would most closely approximate the relationship between (X) how long two people have known each other before they become a couple, and (Y) the resultant change in the extent of the difference in their physical attractiveness?

What do you think the graphical relationship would be?

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