I think all of us, both sexes thought about bringing in another to spice things up. There are just so many issues on so many levels that you could have to deal with. For example, if you had a 3 way and brought in another man, you run the risk of your wife getting to like sex with other men. Believe it or not I have read quite a few articles in mens magazines over the years and they all say the same thing. I have also had friends that had highly sexual wives that they thought they could "tame" and they are all divorced now....The articles reported that you run a 50 % chance of your woman enjoying, (the newness, the attraction, the excitement, the sex.... ) of another guy and she could leave you or end up fucking other guys for fun and you just stay home and pay the bills and get a pity fuck every once in a while....
Or at the very least betray you when you are at work, etc. It happens on both sides of the equation, for men and women. So depending on how solid your relationship is with your woman, you might consider the real risk she might like this new fellow too much and then your paying her back by screwing another woman, the the relationship goes toxic and now you might be single.
I love my wife too much to take that risk, although the situation was broached many moons ago and I chose caution after weighing all the what if's, since I am almost married 20 years I might be out of tune with todays world. . You can go and have a 3 way and go down that road and maybe have a fun and exciting experience but the what if's and the possible consequences would out weight the benefits at least in my view...... its all how well you know your wife and if you are willing to take the risks. But just my opinion from a somewhat conservative viewpoint. And I am not making any judgments here. Live life to the fullest !
Keep us posted.