It's completely unaligned with what I like reading, but I feel most comfortable writing romance just because I love digging into strong emotions and interpersonal relationships and I'm not so good at strong adventure/politics/war plots, which is what I tend to read.
But the thing that underlines what I write the most is just that "something weird/dark", 'cause I like to bring in kinda disturbing/grungy elements into what I write - it's not fun otherwise!