Heroes & Masculinity in "The Sun Also Rises"

The theme of masculinity is interesting to explore in this novel.  With Jake, you have a character who questions his masculinity due to the war injury that left him impotent.  He doesn't seem as openly aggressive and hostile as Bill, though, who is more vocal and obvious in his display of typical masculine characteristics such as an intolerance for seemingly weak or homosexual men.  Instead of trying to compensate for his castrating injury by becoming hyper-masculine in other areas, Jake retreats into himself, never opening up about his experience in the war or how his injury has left him feeling.  He goes through the motions of drinking and carousing with everyone else, but he can't enjoy it because the war and his injury have sapped the purpose and excitement out of his life.  While the feelings he's having and certainly the effects of his injury would be viewed by this group of people as feminine, he still handles them in a typically repressed, masculine way.  His feelings toward Romero are also interesting, since he represents more of the classic male hero, who fights bravely against his foe using a specialized set of skills and ends up getting the girl.  When placed next to a figure like this, it has to be extremely difficult for Jake to see him succeed in ways that he wants desperately, but can never achieve.