There is no such thing as a sex change. One can change the appearance of the primary and secondary sex traits but the "new" person will not suddenly produce sperm or have a functional womb (can they even lactate?).
Our sex differences exist for reproductive purposes. Those who seek to refine what is a family, what is love, etc. think otherwise.
Considering how many different ways a person's gender can be messed up in the first 9 months devolopment I'll just consider that you are ignorant on the subject.
By the way, what is your opinion on people who are naturally (born) sterile?
And finally. Nobody likes being stereo typed, let's at least agree that what Showtime is doing is wrong.