Personal it doesn't matter to me because it shows how comfortable they are with their sexuality. Then I hear stuff like oh there stealing roles from LGBT actors. Then I look at things different. So tell me what your opinion is I like to hear it.
In my opinion, they're actors. That's their job. If they can play the role convincingly, it doesn't matter to me which way they swing. Gay actors play straight roles all the time.
I guess if you know the actor is hetero it could be less believable. "We will never make a difference until we strive to be different"