Though we can argue all we want about whether or not Tyler & the narrator are gay, there's no doubt about there are homosexual elements present in Fight Club. After all, the book itself was written by Chuck Palahniuk, an openly gay man whose other books, besides Fight Club, often feature elements of repressed homosexuality and reference his struggles to regain his masculinity. Consider the context in which Fight Club was written: Palahniuk in the early 90's worked as an auto mechanic, a position which would be very much considered both masculine and blue collar. During this time (maybe 1994-ish), Palahniuk met his now long-time male partner, and the two begin dating. Now, Palahniuk has said in lectures and interviews that he began writing Fight Club during this time. He's mentioned that he was often mocked for trying to become a writer by his fellow mechanics, perhaps more so because of his sexuality, if his coworkers considered writing to be a less masculine activity than being a mechanic. In this male-dominant environment, he very well might have tried to keep his sexuality and his budding relationship on the down-low, perhaps even keeping it a secret entirely. Now look at Fight Club. Fight Club centers around blue collar employees who enter a group of men who anonymously wrestle with one another at night, but aren't allowed to talk about it the next day. Sound a little familiar? Given the context of Palahniuk's life, Fight Club very easily translates into an allegory for gay sex. Now look at the sign of Project Mayhem, an acid kiss given by another man. Though as the writing of Fight Club progressed, it took on more of a political feel, but perhaps the original manuscripts were less so. After all, Chuck Palahniuk's very first novel, Invisible Monsters, was rejected by publishers because it wasn't marketable enough. Funny, because Invisible Monsters was a story about transgender women, and one of the main characters was a gay boy named Shane McFarland who hated himself for his sexuality. Plus, Fight Club itself was written by Palahniuk as a "solution" to Invisible Monsters. He has stated again and again that he set out to write something that the publishers would hate even more than they hated Monsters, hence the darker tone and the anti-capitalist sentiments expressed throughout the book. Starting to make sense? Maybe Fight Club wasn't meant to be about homosexuality at all, but there's no question that struggles with homosexuality were very prevalent in Palahniuk's life, and it would be foolish to try to analyze his work without understanding that. Not to mention, it makes that scene about "Maybe another woman isn't what we need," make much more sense. Palahniuk, too, was a man raised by his mother after his parent's divorce and his father's (later) murder, and if his father ever pushed him to marry a woman as Tyler's father did in the book/movie, it makes sense that Palahniuk would write these characters and have them interact with one another in the way that they did, and any sort of homoerotic subtext seems much less far-fetched. Anyways, that's just my input and a little insight into the context of the writing of Fight Club. Hope it helps.