It certainly would have been adaptive for ancestral man to have a chubby wife during stressful times of famine. Not only would she have had more calories to burn, and thus more energy and endurance, but since fat stores estrogen, she would have remained fertile for longer.
I think there are specific times where film noir is a natural concomitant of the mood. When there's insecurity, collapse of financial systems - that's where film noir always hits fertile ground.
Radio listeners often have a very fertile imagination when it comes to body shape.
A people that has experienced all that the Germans have been through, naturally offers fertile soil for the extremists.
We don't want John Wick to retire again; we're glad he's back in the game. We want a sequel or a prequel. There's a lot of fertile ground to cover.
It is a great thing to have a big brain, a fertile imagination, grand ideals, but the man with these, bereft of a good backbone, is sure to serve no useful end.
Gray space is fertile ground for fiction. When I can see both sides of an argument and feel strongly in both directions, then there's a story there, then I can write real characters that I care about and believe in and champion on both sides.
I'm more interested in character than events. I've observed that about myself as a writer. I find events, even the most dramatic sort, not to be such fertile ground.