Yes and the best pieces advice I can give you is....
1). Be completely honest. Both with the therapist and especially with yourself. All cards are on the table or otherwise all your doing is spinning your wheels and wasting valuable resources that can be used for a patient really in need.
2). Do your research. Look for a therapist that has knowledge of ABDL or at least is somewhat familiar with it.
3). You must be comfortable with the therapist. After all your bearing your soul to this person. Trust plays a major factor here. What you have to understand is that your actually building a relationship with the therapist much like you would with a partner.
4). Go alone at the beginning both you and your wife and use the same therapist. Then when the therapist feels the time is right they will gradually bring the two of you into sessions together. And they will never speak to you or her about what the other says in they're individual sessions. After all your treated as individual patients and they're bound by law, even if your husband and wife.
5). Remember that the therapist, psychologist, or psychiatrist is not there to judge you. They are there to help you and they can only help you if you really want help.
6). It's not gonna be a one session fix. Remember you only have about 45 to 50 minutes per session and that's not enough time to delve into a lifetime.
Good luck.