Aha, finally someone with common sense.
Being Heterosexual is not a choice nor being transgender, but being in a heterosexual relationship or dressing like the opposite sex is.
This is true, but being transgender isn't what we're discussing. Being transexual is the direct argument. And again, there's a certain mindset that goes along with being transexual, that of a female (or male if you're FtM).
I just want to make sure you all understand that transgender is different from transexual.
Transgender is an umbrella term which includes Crossdressers, Drag queens/kings, fetishists (agp), and transexuals.