I was going to quote
@Terrorist and say that I agree with him but it goes deeper than that, and then I read your post.
Gender stereotypes dont explain it in todays western culture. What I have seen from the tranny and lgbt communities I've been into is that transmen tend to be hetero women who are into gay men (there is this one tumblr cow whi has a thread here who draws a lot of M/M porn, I forget her name, she perfectly represents this) or hetero men who are into either lesbians or women who hate men.
Another alternative for the transmen ive seen is lesbians who are into hetero women, and for transwomen gay men who are into hetero men.
When you consider these motivations it begins to make a lot more sense.
How much of this comes from childhood abuse by closeted gays or lesbians, or by heteros who have homosexual perversions because they cant or wont get with the opposite sex for reasons? You look at trannies and hear their stories and youll see these patterns.
Also when you think about it theres a very thin line between "closetted homos" and "heteros who have homosexual perversions because they cant or wont get with the opposite sex for reasons". I wonder what that line is.