Or you could leave it in as a statement along the lines of "okay, he's gay, so what, big deal"
To pull an extreme example - you wouldn't change a straight guy to a gay one because he doesn't get involved with any female in the story.
I can see where you're coming from though. If sexuality isn't important to the story, why bother with it?
"you wouldn't change a straight guy to a gay one because he doesn't get involved with any female in the story."
neither would you explicitly say that he is straight. His sexual orientation would not be mentioned at all.