I don't know what makes me different than many of you, but I am now asexual for many years, in fact, since my wife left, i have not touched another human in any sexual oriented manner. This was long before i even thought of HRT or being trans!
I am one of the asexual persons leaning heavily lesbian. I am more or less (or my body that is) feminizing for at least 10 years now, but my sexual orientation has not changed a bit. I now consider men even less attractive hat I did a few years ago. I have hardly any male friends, because I do not seek their company (actually never really did). At the moment I feel that I will stay asexual even after any SRS surgery, and I hope the HRT will not do anything to my sexual orientation!
Might be that being asexual for such a long time already, and any sex related thoughts are non issues for me, helps me to not have to think much about my sexual orientation, and I can concentrate on to become a woman without all that sexual ballast to be dragged around.
I just don't know!