Obviously due to their causes this would not work and may in fact be detrimental to the other two groups of trannies, but for the congenital homosexual trannies, I wonder if there is any sort of study where they treat them with natal-sex hormones. One would have to account for the shifting definitions and biomarkers but I think using exclusively homosexual males and females with measurable opposite sex characteristics (digit ratio, fMRI results, etc) one could narrow down this very specific group and test their behavioral changes in response to reinforcement of correct hormones.