Psychoanalytical theories.

These are based on the assumption that male gender identity requires the male child's separation from his mother psychologically so that he does not identify with her as a member of the same sex, the way a girl does. It is thought that exhibitionists regard their mothers as rejecting them on the basis of their different genitals.
Therefore, they grow up with the desire to force women to accept them  by making women look at their genitals.

In my case, because I never seprated from my mother psychologically, thus I identify as a female and thus I'm a Pre-Op male to female transsexual type.