What kind of transformation most appeals to you and how would you behave, once transformed?
There are many types of actual and physical transformations: from man to woman, shrinking or becoming a giant, becoming another creature or regression to become younger, to a bimbo or a slut, or maybe just a part of your body or physique which transforms itself. Maybe something else entirely?
The only one which appeals to me from this list is bimbo, and even then, only occasionally. I see it as a fun way to escape everyday routines and stresses by just focusing on being fun, sexy, and not having to think too much :)