Some of these ideas are possible, but probably immoral or illegal to try in real life. But what fascinates me are the ideas that are totally OK in real life, except for the social stigmas.
A lot of my stories involve weight gain and the glorification of plus sized women, and I've found (not surprisingly) that the biggest audience for such stories are guys who, at least in a fantasy setting, prefer that type of woman or transformation. Yet some guys I know would never date a plus sized woman in real life because of the social stigma. Speaking for myself, I like plus sized women and have dated several in real life and enjoyed it.
What about you? Is your favorite transformation possible in real life? If it was, would you do it? Why or why not?