The subject matter and story lines of young adult literature are typically consistent with the age and experience of the main character, but this literature spans the spectrum of fiction genres. Stories that focus on the specific challenges of youth are sometimes referred to as problem novels or coming-of-age novels.[6] According to 2013 statistics by the speculative fiction publisher Tor Books, women outnumbered men by 68% to 32% among submissions of this type of fiction to publishers, a gender distribution converse to that observed, for example in adult science fiction and most fantasy fiction.[7]