"More research needed", of course.
I'm not sure that reading fiction leads to more progressive, political outcomes. After all, the term "fiction" refers not only to the literary fiction reviewed in the New York Times and discussed on NPR but also to military thrillers of the Tom Clancy type and to "Christian fiction" such as the apocalyptic novels of the Left Behind series. Over the past four decades, books like these have enjoyed a wide male readership and in doing so have helped push US politics to the right.
The viral panic over men’s reading habits, fact-checked | Vox