It is more than a little conceivable that something highly desired yet unattainable before puberty could take on sexual overtones upon entering it. Since most trans people are aware very early that there is something going on with their gender identity, that longing can be carried along into the creation of the sexual being.Some older trans people, and in particular those who were not self-accepting, would have easily fallen prey to the idea that they suffered from a perversion rather than a biologically engrained reality. In this type of scenario you could see how some could have bought into AGP theory. In fact, quite a number of years ago I was contemplating it's validity and I remember contacting Anne Lawrence to discuss its merits.
What has happened since I came to fully embrace my identity, is that a trust was built upon my earliest feelings and instincts. Rather than rely on conjecture, I relied on my internal compass to guide me.
It made all the difference.