Well that makes me a bit sad. I'd worry that all of my books were lonely and would make an effort to either loan them to people who could read them quicker than I would get to them or try and read some in every book as often as I can.
Historical Fiction is what I gravitate to the most, I think. I enjoy a good romance but it doesn't have to be the center of the book unless that's what I'm in the mood for. Some fantasy. Ultimately with a book I like to feel transported to whatever world I'm reading about.