Alright dipshit, let me explain this to your dumb ass. Your body carries chromosomes. Those chromosomes act as the producers of catalysts that decide certain particular chemical reactions.
Kylies Mitochondria used many of those chromosomes as a map to trigger targeted growth and death of certain cells in an orchestrated fashion to form and unform almost every inch of his body, you stupid shit. This is biology. Kylie's Mitochondria were told to form him a dick, testicles, prostate and several other objects. Then after these were formed while he was in the womb, his body started using this chemical road map to construct and orchestrate nearly every chemical reaction in him since then.
This is basic biology, you SJW asshat. Don't confuse me with a bible thumper or any aspect of my civility goes out the window you horrific piece of shit.
You may not like that his body tells him he is a man. You may not like that he is stuck this way now that he wants to be a woman. But he is man, and unless he can find some kind of physical compromise he will remain a man, period.