The undercurrent of homosexuality in both Fitzgerald and Hemingway was written about decades ago by the critic Leslie Fiedler, who said that all the major female characters in their novels were really boys disguised as girls.
"Sex and the City" pretty much was about gay men trapped in women's bodies.
Hemingway was often poor at writing female characters, but I wouldn't describe them as boys disguised as girls. And there's always the exception like, Hills Like White Elephants.
I think Fitzgerald usually does a great job with female characters. Perhaps Daisy Buchanan is the most memorable female character in U.S. literature since Hester Prynne?