I don't think I've had to make any sex changes (don't have the medical background for it anyway) but there were some mental pictures of people that got changed.
I think, therefore, I get bananas.
When in doubt, think about time travel conundrums. You'll confuse yourself so you can forget what you were in doubt about.
What's the difference between ignorance, apathy, and ambivalence? I don't know and I don't care one way or the other.