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.
No this will not make him sterile.
Practice to not make a fool of yourself.
No but they will make his bread rise
Yes
Don't do it.
Tell a joke?
No.
No.
No.
Sniff super glue
Make sure the person doing the biopsy uses sterile aeseptic technique. Perhaps a prophylatic antibiotic out to be given. Do not touch the area without hand washing or using a sterile dressing. Keep wound clean