I never set out to be a romantic novelist. When I started I was writing short stories that appeared in obscure literary magazines and occasionally on Radio 4. When I completed the first first draft of my novel and handed it as part of my MA, my tutor said, "And now you've got that out of your system, you can get down to writing a real novel."
I still haven't written a 'real novel'. I'm just writing about what interests me. Generally it's about women, because I think they have less clear cut, and therefore more interesting, decisions to make about how they live their lives and balance work, children and relationships.
I don't think people have a choice to make about what they write - and anyone who thinks they do have a choice has never tried writing a novel. They write what they write, and usually that's what interests them. If it interests them, the chances are it'll interest other people. And if that means I go through life never writing a 'real novel' then so be it. I'll just carry on muddling through and writing about what interests me.