As was posted before, she may feel that she knows what your reaction will be better than you. It is one thing to look forward and want to watch your wife with another man, and another to
actually watch it. So while you are sure
right now that you won't feel any jealousy, remember that when it
actually happens your feelings may change. This is a very real possibility and generally part of being a cuckold.
I think it is better to take things slowly on this front, and doing so might help your wife feel more secure going forward. Take a few baby steps here. So far you have been hearing about her night's out post - game, and that is a good start. Now she needs to for you to prove that you aren't going to suddenly get jealous if you actually see her with another man. My suggestion is that you both go out to a bar, maybe an hour or so from your home town and take separate cars. Don't sit together, but be able to see each other. Then stealthily watch as she gets hit on. Watch as she is bought drinks and becomes a little tipsy, and actually kisses another man. Then when you both get home have a long talk. You can show her that there is a chance that jealousy is either not an issue, or a reasonably controllable one, by your reaction to
actually watching her with another man in a much lower intensity situation than intercourse.
If this goes well, you will probably be able to talk her into doing it again. As she feels your support you can make this a regular thing, eventually even making this your Friday or Saturday night 'weekly ritual'. Over time you could encourage her to flirt with a Black man, and that would probably be a good next step - the next barrier to break.
If you do this as a couple for long enough, and she sees that jealousy is not an issue, she will become more and more comfortable with having extramarital relationships. The next step I would suggest is perhaps a bit sneaky, but will be
VERY effective if you do it just right. Once she is
entirely secure with your 'weekly ritual' (this should be after months of successful nights of watching her in action), you should tell her that you have an something to do beforehand and will meet her there as usual. Then, fail to show up on time. She will probably call you on your cell (unless she is being swept off her feet by another man while she waits and looses track of time). When she calls, explain that you have a flat tire and will be late. You will have to change a tire on your car to the spare and empty the air just in case she checks the next day. Arrive just before last call so that you have given her an entire night to fly solo. If everything goes well she will now have the confidence to start to date other men without you, and that is the next step . . .
If you have proven to her that you won't be jealous and she becomes comfortable flying solo, it is just a matter of time until she finds a man that she would like to date exclusively - which you need to encourage. Whatever you do, don't pressure her to watch her and her new boyfriend!! Let her pursue the relationship without your interference. You need to accept that she may not be comfortable for some time (and maybe not ever) having sex with another man in your presence. But if you are patient and supportive and make it to this point she will very likely cuckold you . . .