Do I have to shave my head for a hair transplant?

[M Law]

Hi everyone,

I appreciate all of the the responses that I got about the difference between FUE and FUT, and think if I decide to move ahead I'll be having an FUT. The scaring in the back does not bother me since I do not plan on shaving your head.
My question now is do I have to shave my head to have a transplant? I notice in the photos that some the heads appear to be shaved. What's the advantage of shaving the head?

Thanks in advance!