I have to say that I don't see a lot of gay RP here. You'll have more luck finding someone if you post this in GLBT personals or something. I have no clue why there aren't many gay or bi men RPing here but that's just the way it is.
There's also the 'Seeking roleplayers and inspiration' sticky thread at the top of the main SRP forum. You can post this ad there where it will be checked out by more people.