What about the autogynephiles - the males who get off to the idea of themselves as woman? Very common amongst the MtF transgenders, you can see all the signs o

What about the autogynephiles - the males who get off to the idea of themselves as woman? Very common amongst the MtF transgenders, you can see all the signs of it just browsing their forums - men talking about their "euphoria boners" and such, when they adorn themselves in women's clothes. For this subset of transgenders it is fundamentally a sexual urge that drives their transition.