"One would think normal differences in brain structure would at least match one's anatomy. If you desire something you can't even physically accomplish without purchasing a spare part at your local sex-toy store, then I think it is fair to say you were not "born that way" or at least "born to be that way." At best, you could argue bi-sexuality. Clearly everyone has got heterosexual parts, so homosexual desire would leave all homosexuals in the bi-sexual category. Even then, you would have to admit abnormality, since the desire is contrary to the biology."
Unfortunately, brain development occurs at a different period during gestation, than the genital structures. That is why researchers were able to produce rats with sex-reversed behavior.
The experiment was carried out by administering cyproterone acetate, a potent anti-androgen, to pregnant female rats. When the drug was administered at a specific time during the gestation cycle, the male rat offspring behaved in a female manner. The male rats exhibited lordosis in response to sexual advances by male rats, the typical response of female rats.
Thus, the researchers demonstrated the experimental production of rats with sex-reversed behavior, independent of genital structure.
It would seem that an accidental result of the administration of diethyl stilbestrol, a synthetic estrogen, may have in some instances, produced sex-reversed behavior in daughters of women, who were given the drug to prevent miscarriage. The girls were tom boyish in their childhood and adolescent behavior, and between 40 and 50% percent of them grew up to be lesbians, versus about 5% of the rest of the population.
I'd like to see a link to that research. My mother took estrogen during her pregnancy with me and I had/have none of the above behaviors.
BTW, that number is closer to 1.5%.