If you have a half hour,
this a fascinating read about how transsexuality is really transgender (its a personal construct).
Apparently, the only sanity left in this discussion of transgenders is in religious organizations.
A curious aspect of transgender male to female (notice how the discussion almost exclusively focuses on that) is the supreme desire to not socialize with men, but to engage straight men in relationships. As is hinted at and seen in broader society, these sorts of gay men hyper-identified with their mother as a child and seeks to repair their relationship with their straight father by surgically going under the knife to approximate a straight women in order to approximate a heterosexual relationship. There is a reason transgender folk always get the tag "narcissist" when undergoing therapy.
Some are straight guys,
like my ROK article on "Sissy," who refused to identify with his father and identified with his mother, as signified by his dated approach to women's fashion. These sorts of men usually transition later on in life -- after divorce -- and unlike gay guys, they are not interested in "passing" for female, as this isn't sexual.
Of course, to this date female to male transition is fraught with difficulty, as often time the fake penis created eliminates the ability to orgasm. Which -- in a nutshell -- says what all this is about. If a woman truly believed she was a man, giving up orgasms would be a small price to pay for internal tranquility. Since this is about running from that inner peace, giving up orgasms stops most self-proclaimed female to male transgender from sewing up their vagina and undergoing phallopasty.
Sometimes transgender advocates say the existence of transgender folk in many different cultures is evidence that is a biological reality. That means nothing because personality disorders, internal strife and child abuse exist in every culture.