What are the motifs in Norwegian Wood by Haruki Murakami?

Sex is a recurring idea in the story.

Naoko and Reiko both have issues with sex. In Norwegian Wood, sex exemplifies the disconnect between the mind and the body. When Naoko is in love, she cannot get sexually excited. Her body cannot follow her mind. It is symptomatic of her inability to give herself fully to another person and to experience communion. Similarly, Reiko's body responds to her piano student, defying her mind and intellect. Reiko's body and mind are not in unison.