As a resident, I'm supervised by an attending. He's gay. He knows I'm Mormon (although I have no idea how), and I think when he first introduced his partner he was wondering how I would respond. I think the fact that I took it all completely in stride is why he now feels comfortable talking about the church and/or gay topics without caution, and I'm glad.
On the other hand, my closest neighbors are gay too. I don't know them as well and I think they may wonder whether I've "put things together". I wonder whether they've put it together that I'm Mormon as I cart my little family to church every Sunday. The problem is, if these things never come up in the across-the-fence chats we have, how will they ever realize that I'm not what they may think I am?
I had a neighbor not long ago whose front door was inches from our own, and he had calendar boys over to spend the night all the time (frankly, I don't know how he reeled them in!), but we never did get around to making it clear that we're fine with him living his life the way he wants, so I think he just assumed we were bigoted Mormons. We lived near him long enough (and parked near enough) that there's no way he could have missed the LDS trappings over time.
There are several other gay guys in the office besides my attending who I haven't had the chance to get to know personally. I don't want to miss out on good friendships with neighbors or coworkers because of a misunderstanding of what I might believe about gay people, but I also don't know how to say, "So... you're gay, I'm Mormon, and I'm totally fine with that. Any questions?"