Thanks for the input guys. The wife and I have discussed it quite a bit and are both comfortable with her spending a little time alone with him on a one time basis, no dating, etc,. The three times we've all been together have been just great but he still seems a little timid and unsure of his role in all of this. We ckind of thought that he might loosen up a bit and talk a little more about his desires etc if I was'nt in the room, as well as her assurring him that he's an equal partner in this arrangement and that we want him to realize his fantasies as well as us ours.
Again thanks for the input...I'll share your thoughts with the wife and maybe rethink it just one more time.