Lets just say that life is about limits.  I did it once, quite a few years ago.  We each took an end, and she rotated periodically.  It was very cool, and I appreciate the opportunity to be reminded of it.  For us, it was very important that no sword fighting came into play and it worked out fine for all of us.  As long as everybody is on the same page, it's cool.  There's not really a right or wrong, but there's lots of moving parts involved, so it should be discussed in advance.  At least that's my .02

Yep, did it in Vegas in Feb.
Much like acidom, I wasn't interested in, umm, "interaction" with him, and everyone was fine with that.  In this situation, I think it is mandatory for everyone to be on the same page as to what is or isn't O.K.
As an experiment it was a great success, though it isn't something I would feel compelled to do again (though I wouldn't mind seeing her alone!)

If I did it right, the link is my review...