Mischa, we mustn't forget to consider those who are into the AB thing for neither reason. I, myself, and others, identify only as PART AB. I am a diaper lover with some AB tendencies...I would "play" daddy, or baby to the right girl or boy, for lack of a better expression, depending on how those roles could work with a certain person. Primarily wearing diapers and wetting for gratification, I consider the AB thing to be something that comes with territory that I happen to enjoy under many, if any, varying circumstances. That's my 2 cents!
Matt