I'm a 36 year old male diaper lover in Virginia.
I think that the thing that got me into this whole thing was when I was in 3rd grade. I was dared to pee my pants in the middle of class by a friend, and being the impressionable kid I was I went through with it. Needless to say the questions that my parents asked were really embarassing, because they thought that it was a problem with how they had raised me.
The fact is that I learned that I really enjoy just being able to wet or soil myself when ever I feel the urge. The whole infantilism thing isn't really for me, but I do have to admit that I love wearing diapers because I can just pee or poo when ever I need to.
Typically I don't soil my diaper because the clean up is not worth the relaxation I feel when I can just let go.