It could be the unique and engaging plot. If the story has an original take on sexual experiences and relationships, it might attract a lot of readers.
I think a good best seller in this category often has relatable characters. When readers can connect with the women in the stories and their emotions, it makes the book more popular. Also, the writing style can play a big role. If it's vivid and evocative, it can keep readers hooked.
Well, a best seller about women writing sex stories might stand out for its honesty and depth. It could offer insights that are both provocative and thought-provoking. And maybe it breaks some stereotypes, presenting a fresh perspective on sexuality and women's experiences.