such a concern over labels in this thread - who cares? besides, a lot of the people throwing the word gay around are probably also people that believe their ladies like swallowing or anal just because they do it. here's some reality for you - many, if not most, do not like it, they just know...
Trust me, if it is a real dear friend of hers she wouldn't be putting her into this situation unaware. She had likely shared everything with the friend and they're both looking forward to it. I'd be surprised if the friend doesn't want wife's bulls also. Enjoy the freedom of leaving it all in...
I don't make her do anything, but I strongly request that she go without bra every now and then. She's only done it a few times when we were younger. Not recently, but we're at a time in our lives where she'd be more likely to in the right setting - i.e. an adult club, at an adults only resort...