Firstly, congratulations on your wife finally agreeing to have a MMF threesome, alot of husbands/boyfriends struggle to convince their wives and most never agree to it unfortunately. In my humble opinion, you and the wife should definitely talk with a bull for an extended period of time BEFORE the first encounter so that there is some chemistry already developed. Also, several non-sexual friendly hangout visits could also help her ease her mind into it a bit better as well. Pick a gentleman, someone who is respectful and is willing to put in the time and the effort to develop said chemistry. Lastly, you want someone who is open to something ongoing as well, most wives in my opinion prefer some kind of ongoing arrangement with a single man instead of loose one night stands because they feel more comfortable with a regular person who knows the ins and outs of what the wife wants. Just out of curiosity, where do you guys live? province? city?