It is a tough balance, sharing such a thing and dealing with the potential aftermath. If things are slowing down naturally for you with your wife, the question is, has she complained, or is it slower for her as well? If it is one sided, then I feel what have you got to lose to introduce a little fun by introducing a diaper into your routine. If this gives you more drive and ultimately leads to better passion towards her, then there should be less objection if done slowly with her OK as you experiment. I know when I was more intimate with my wife, I seemed to step it up a notch when diapered. Unfortunately, I lost focus and started to ignore her needs at times and as soon as it became "you are only interested in me when diapered", the diaper becomes the enemy and tensions become more open. That is not where you want to be. So take it slow and introduce the idea. Having one with you, not on, but in view, is a good first step to acceptance. Make it a game with the end result to be diapered. Just keep her needs in check at all times and things should progress positively.