If this is actually a serious post... then I'd have to answer your question with a "probably not" Having sex with another man's wife is generally considered uncouth in most circles, now if her husband knows about it and doesn't mind/or approves... who knows. I guess it depends on the situation. I personally find it sort of off-putting to be hangin out with another naked man in a sexual context, woman or no. And I think I'm pretty liberal about that kind of thing. Plus three-somes of any kind are a little stressful to begin with, in my experience, someone usually ends up being "left out". Then that unfortunate person is stuck, pun intended, holding his own dick.
I might just be old-fashioned, but I prefer one on one. Just my two cents, I hope it works out.