Defying the norm

My concern is about contemporary literature. My concern, is this smutty literature really needed? Why did Silko feel the need to include the smutty scenes in this novel. I understand that all contemporary literature contain these types of stories, but are these stories needed. I do not think that Silko would have lost any part of her novel by leaving out all of the raunchy sex scenes she included. Silko defied a lot of general rules in literature by not seperating her novel into chapters and by not using strong transitions between stories. Silko wrote a great novel but why couldn't she have left out the sex scenes and defied the norm of including these scenes? It seems as though her points would have been made by not including the graphic scenes.