There are two energies that all people hold within them and can be symbolically represented by testosterone and estrogen even though it is not purely symbolic but actual.
One energy creates the desire to penetrate (act on) and the other to be penetrated (be acted on)
Usually the energy to penetrate is strongest in a male and weakest in a female and the energy to be penetrated is strongest in a female and weakest in a male.
These two energies in a crossdresser are equally strong (and they were born that way) creating a tension as each energy seeks dominance (need to be expressed and experienced) so they have the "potential" to be bi-sexual but not the "need" to be.
The sex act is the result of the mixture and relationship of these two energies to each other.
Within certain people this energy can flip back and forth in dominance so you want to "act on" and be "acted on" like a form of movement through time.
Crossdressing can be the expression of both these energies in that when you feel feminine "acted on" but see the image of yourself as a female so than experience the energy of wanting to "act on" creating the experience of both energies happening simultanously so you have the experience of the " self f..k " wanting to "act on" and " acted on" at the same time.
This could be highly addictive because there are than no restraints, you have
made two into one.
Sexuality is the expression of the relationship between two opposite energies in each person and this relationship was determined at birth so it is part of you that you than learn ways of finding harmony with (inner peace) so there is no majority only each person finding their own
truth.