Or...

Fiction drives home unrealistic standards or extremes.

I found the data to be dubious ofcourse. Just like we can extrapolate all sorts of nonsense from data - movies aabout relationships might not mean anything at all.

Considering that life is 90% boring routine and fiction does not show or truly represent that boringness in order to sell the story. They need drama. Thats why writers wont write about a perfectly normal day with a couple talking about tiles for an hour dialog near the kitchen sink.