Our friendships run the gamut from vanilla folks to swingers we are only friends with, to swingers we have played with and are mostly just friends now, to swingers we have and will again probably play with. It sometimes takes a bit of thinking to remember who's who and what's appropriate discussion
We all get together when we can and this includes family only (no sex) type events, like bbq's.
Probably the best example we have is our wedding, which was a mixed wedding.....swinger and non swingers. The best man and the photographer are swinger friends. About a third of the guests are swinger friends. There was a LOT of discussion beforehand amongst the swingers - and a lot of teasing as to what a response would be to 'so...... how do you know the bride and groom?'
The bottom line is we all agree with and abide by discretion, and the only close call we had was my mother commenting to me about one swinger guy who is particularly outgoing who spoke briefly about their visit to a nudist resort. She said to me 'my...what an interesting man!'. You don't know the HALF of it Mom.......