First interesting thing: Getting an infection is uncommon. Most urologists do not place a suture in the small opening necessary for doing the procedure and this may be protective.
Second interesting thing: If there is a sperm granuloma or some swelling or tenderness under the scrotal skin, it usually resolves on its own and…is it almost always just on one side. In my experience it is rare to have an issue with both sides of the procedure. Each side is independent of the other. Go figure!
More questions? Go to the vasectomy page and read the eBook.