I told my wife when we was dating that I loved diapers and about the whole adult baby scene. She was very understanding then and she still is now. I am not saying it was easy telling her, but it was one of those instances I knew that if I was going to spend my life with her I didn't want any secrets. So if you are planing on telling your girlfriend just make sure first you know who they really are and if you decide to tell them be honest and pour your heart out to them. The parent portion of the question I wouldn't know because I never told them. Good luck with what you decide to do but let us know how it goes.