I have just read Twilight by Stephenie Myers and it made me think that there are two literary genres (or are they themes?) that I've never seen discussed, or named, yet I'd say they are the most popular of all.
For women, it's Cinderella Suffers in Luxury. Bella is a good little girl, and she cooks and washes the dishes for her daddy. Edmund (and sometimes his sister) FORCE her to go to parties, drive posh cars and wear nice clothes. She cries a lot and feels pain all the time. See what I mean? Danielle Steele was brilliant at this type of novel. It's usually a sub genre of romance.
For men, they like to get into a small enclosed area such as a submarine, a prison or a court room and shout at each other. I call this (think cockney accent) Geezers Shouting at each other in a Small Place. But is it a plot, a theme or a genre, because it pops up in all kinds of settings? I adore SF - but not when it's Geezers Shouting at each other in a Spaceship.
Alas, I've not patience to write a Cinderella Suffers in Luxury story. I'll never be rich!