"J. has decided he WILL call him, but he needs another evening to figure out what to say and be tactful about it"
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J to be tactful? Surely you jest! Alchohol or not, M deserves no tact!!! I mean this goes a little beyond "kiss and tell". Yes? I think that M has earned to be cut-off as a friend and any future pleasure. He will
know why, and I
think that in itself
might give J some semblance of vindication. I mean think about it from J's view.......this ninny is running his mouth that he fucked a man's wife while in the company of the husband and non-swing friends!?!?!?!?!?!?!?

It would have been bad enough to be drunk, and spouting off at a swinging affair, but this is much worse IMHO.
I also agree with a previous poster. We keep our lifestyle far, far away from non-swinging friends and family. Closest I ever got to that was a 1 on 1 with my ex-b/f, and never seeing him again in life is okay with me.