Naw I wouldn't act differently around them because they are still considered family. It probably would be a little weird at first because you never would expect it. but i still woulc chill with them if a person is cool then their cool.
Honestly I dont understand why it is such a big deal. As long as they are in a healthy loving relationship I would be happy for them. You have to be who you are, there is no way around it....
Like Rod said, if you my people you my people reguardless, but of course ya gotta know your boundaries. I have a friend (girl) who is and we still as cool as ever, but she knows that I don't like the lifestyle. She actually was someone who told me and had me look into info about it and how people were delivered from it. As far as friendship, I would never put that down over somethin like that, unless other aspects came into the picture.