In truth, I so admire stories that have actual problems/conflicts that must be solved, I might have kept reading Harrington's novel if the main romantic couple had been male.
But conspiracies don't interest me--and romantic heroes who badger romantic heroines for information while the romantic heroines stalwartly refuse...interest me almost as little.
I much prefer to watch the hero and heroine work together. There are traditional romances that accomplish this end. In Total Surrender by Anne Mallory presents a dour hero and a cheerful heroine who nevertheless work together to salvage her father's business. Imagine if Eliot from Leverage got together with a female version of Hardison...
The Anne Harrington book A Relentless Rake starts with a brother and half-brother (father's bastard) receiving instructions on their assignment. And I immediately found the brothers' relationship more interesting than the possible romance. Granted, they are brothers, but that biological tie is easily kept or tweaked; the "working" partnership could be explored in terms of friendship and/or romance.
I've discovered the same with my Georgette Heyer fan fiction. In some cases, keeping the original pairings is more effective. But in some cases, a male/male pairing become infinitely more interesting. 
So, for instance, with The Unknown Ajax, I kept the original pairing--Hugo and Althea--but concentrated on Richmond and Vincent in my fanfiction. In the book, Richmond is a wild young man who wants to go into the army. His doting grandfather refuses. Richmond appears to become quiescent but in fact is busy running a smuggling ring. Vincent is a sardonic man who doesn't appear to care about anything. Even though Richmond looks up to him, Vincent keeps his distance until matters reach a crisis. Then all the cousins have to pull together.
Richmond and Vincent coming to terms struck me as far more interesting than the warring supposed opposites, Hugo and Althea. Hugo and Althea are a decent couple but so much "oh, no, I'm not REALLY attracted to you" bantering does get a tad tiring after awhile.
That is, I prefer Nick and Nora--already boon companions who banter--working on a separate problem than what my mother (in a different context) once referred to as "revolving door" relationships. Richmond and Vincent are already friends. The issue isn't one of "yes, but do I really like you?" The issues are Richmond's tendency to hero-worship and Vincent's tendency to cynicism while, on the action side, the issues are Richmond's desire to get a commission and Vincent's willingness to drop his pose for at least one other person.
