I think that if you just write your characters you end up with something that people can access.
Voice isn't fixed or unmalleable, it adapts to the characters you are creating and the story being told. I suppose in some way that's true in life - a little flexibility goes a long way.
I really, deeply believe in the primacy of character. I believe that my job as a writer is to put a believable human being on a page.
I couldn't imagine a book with many characters in it and one of them not being gay. It would have felt like a glaring and problematic omission for me. But I also wanted to write that character as a person, not just a gay person.