How to get your novels marketed as 'literary fiction' rather than 'young adult / fantasy / romance / women's / science fiction / etc'

Because I write young adult books, I sometimes field inquiries from people who've written books with age 13-19 protagonists and want to make it clear to potential agents and publishers that their book is not a young adult novel.

This is a problem that particularly affects women writers, because there are entire genres whose purpose is, basically, to cord…