How do I get my wife into fucking someone else? Any suggestions?

Find out what the hurdle is that is causing her to refrain from going further. It can be anything including her parental upbringing, religious ideas, stories she has heard from other women, shyness, concerned she wouldn't look attractive to another man, or just doesn't know how to go about it. I used to tell her stories when we were in foreplay...maybe something I had read or just my own imagination...just getting her hot thinking about someone watching us while we were having sex or a threesome with another man or woman (finding out if she is bi) etc etc...you can get all kinds of ideas just reading about people's real adventures here....so over time the idea of having sex with another man was not foreign...indeed it was exciting to her...then watching some movies or if she is a reader getting her some erotic literature that involves cuckolding,,,,just planting the seed....and then when we were out and we saw an attractive guy you ask her if he is the kind of guy she would like to have sex with...or maybe she has a crush on a co-worker, boss, neighbour, friend, acquaintance, relative etc. If she is into it you will get positive feedback....if she is not you won't. If she is not interested then it will just remain your dream....
 
I had commented on this topic earlier but wanted to add another comment. One of the biggest problems I had talking to my wife with prior to starting this lifestyle is many times when I would bring it up she showed no interest talking about it. There is no need in pushing the issue when they are not in the mood and its hard to know a good time to bring it up. This can be very frustrating and cause friction in the relationship. This has worked out well for us but I can tell you that I did not think there was once chance in a million she would have ever become a hotwife and now a cuckoldress. After all the frustration of not being able to have a conversation it all chanced because of a cell phone call while she was going to meet a old friend for a drink. I remember how nervous was not knowing how she was going to respond when it told her " I love you very much and I know you were very close to him for years, enjoy your evening and I am OK with whatever happens" She returned home to me a different women and that evening changed our life.

My point is timing is everything and for us a simple phone call did the trick.