Huge market for what we call in the movie world, "Hard R" - meaning gore, sex, and serious violence/scares. The horror crowd LOVES to read, and the books need to be marketed to that group. And there are plenty of women in this category, not just dudes - again - the marketing needs to target this group of fans. They are out there. Check the horror forums/sites - and this includes the film blogs/sites. In fact at one of my film festival stops with my last flick, I won a contest and sure enough, the prize was a collection of horror books. I typically write MG fantasy/adventure, but am getting back to my roots and am planning a few "Hard R" YA horror books.