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No this will not make him sterile.
No.
A man can not control his testis. Testicles are not controlled by thought.
Sterile.
First of all women does not have testis aka testicles. And a man can not insert his testicles into a woman's vagina.
It depends on where the cancer is. However the treatment for cancer can.
Unhappy
It depends on why the man is sterile. There are many causes. If he has had a vasectomy, an operation to make him sterile, that operation can now be reversed for a majority of men, if they want to go through the hassle and expense. If a man is sterile for some other reason, there are many possible medical reasons and many possible treatments. Only a fertility expert knows all about it.
It not likely to do any harm later.
It is not likely to happen.
nope
for the surgeon to begin operation his scalpel must be sterile. a man who is sterile can not have children.