Why some shemales don't come and some do it like a fountain?

[sesame]

The hormones will...eventually eliminate erections and ejaculation
Shit! Oww Noooooo! That would totally kill the intriguing beauty!
I read a long time ago, in an article by Gia Darling, the on Hormones and off hormones stuff. Well how long does a Tgirl need to be on-hormones? And after how much therapy can she finally emerge from this hormone taking phase, ie, off hormones? Once she is off hormones, can she get erect or, come again? Or, are those good things gone for life?
Tell us, reassure our unhappy souls, good doctor Bionca... ...