Just off the top of my head, I can reasonably assert that The Fiend and The Murder of Ramon Vasquez from The Most Beautiful Woman in Town would fit comfortably into any noir short story anthology. There's also a grim take-off on Hemingway's The Killers in Tales of Ordinary Madness (can't recall the title) that is practically textbook noir.
And I don't recall any homosexuals in classic film noir?
Sure there were. Joel Cairo in Hammett's "The Maltese Falcon", Bruno in Patricia Highsmith's "Strangers on a Train"; in fact Highsmith, author of the famous Ripley novels, frequently employed thinly-disguised gay characters.