Last year I met a girl who thinks she is a FTM transsexual. However, she dates guys. She is most probably also an Aspie.
I don't really believe in the idea of such a person being a transsexual. She's a "boygirl" as we would say here, a person with a typical "manly" personality but born with a vagina. If you're born with a vagina but still have an attraction to men, why do a gender change? All you have to do is dressing like a guy, cutting your hair short etc. The same goes for a man who is born with a penis and has an attraction to women, although he likes having long hair, a smooth body, wearing a skirt or dress etc. You can address them as what they like, but I find a change of the outer genitalia totally unneccesarily for them, because the sexuality is in the brain anyway.