As the female in a cuckolding relationship, I can tell you that what somebody here said about your wife being a total slut and doing things she would never do with you is right. Not because she does not love you, but because the bull/date is only a fling, and you are always there. Your opinion of her is essential for her.
For the first two years, we were in the LS, we only played together in MFM, even if hubs only watched me with another guy. But she is correct; it is much easier and fun when you aren't worried about what your husband is thinking.
She will have a great time with her stud. Just don't act jealous when she returns. Share in her experience and show her total acceptance by listing to the details she chooses to share without pressing her for things she wants to hold back. Let her know that her actions are fine, eat her pussy clean, she will love it, and it will make you a part of her experience,
After two years of MFM dating, I finally went out with a guy alone. We traveled to Aspen together, and it was four nights filled with some of the wildest sex I have ever had. And yes, I did things for him that I still, to this day, would not do for my husband. He is my husband and life partner. He visits my parents every month, yuk. But the boy toy, he is just a sex partner, and it is all good until its not and then I will find another one. But, hubs is my life.