I used to teach some of this stuff at a university and agree with sometimes_miss and Julogden. You are looking at only one of at least six possible causes. And the six can work individually or together to produce differing degrees of gender identity and/or sex organs.
In addition to "testosterone wash," there are also things that can influence or damage the X and Y sex determination chromosomes.
In the sex chromosome pair (pair 23) there can even be missing or surplus chromosomes, so all or part of you can be XO (no second sex chromosome), XX (female norm), XY (male norm), XXY, XYY, XXX, or ???
Then there appear to be sex and gender genes on other chromosomes that can control subtle (and sometimes even not so subtle) expressions of sex and gender.
Then there are the mother's hormone levels and the levels of hormones in the fetus, along with when in development the various "washes" occur.
and on and on and so forth.
That could explain why there is so much variation in the CD/TG/TS/whatever spectrum and why each of us is a unique and different individual, not easily subject to being categorized and labeled.
