Why do you really want to share your wife? This is a question you need to be prepared to answer if your wife ever ask it. Is it really for her or for you? Are there any ground rules?
For me I would like her to have the experience of enjoying another dick, and for them to enjoy not only her tight pussy, but her ability to milk them dry with her cunt muscles. Also, would like her to have fun of another man's attention, to learn how to @@@@@@ herself more.