How can I explain why I wanna do long term chastity

So me and my wife were discussing chastity as a kink recently and I told her I want her to be a key holder. She seems iffy and said she doesn't understand the kink and would be down if I could provide her resources and explain why the idea is hot. I just told her I want her to take my manhood away but then got thinking what are some other prospective and things we should discuss.