On Literature SE there seems to be a general consensus that in the Great Gatsby the narrator, Nick Carraway, is gay (or at the very least sexually ambiguous).
I found this article on one SE answer: Gatsby: Gay Implications in Nick Carraway. While it appeared to answer my question it ultimately skirted around the ultimate significance of Nick being gay and went more for proving the fact.
I am of the same opinion. However I am having trouble understanding why Fitzgerald would choose to make Nick this way. How does it contribute to the reader's understanding of the themes? Did Fitzgerald merely do it because he could?