Getting Kicked in the balls is a very painful experience at least for around 30 minutes and sometimes longer depending on how hard you get kicked in the balls.
Still it's very rare to get permanent damage done by being kicked in the balls unless the kick was way too hard and then it might.
Usually though the kick in the balls is just painful and will do no harm.
Several people have been kicked in the balls and still were able to get a woman pregnant so it doesn't always make you unable to reproduce should you get kicked in the balls.
Still it's a good thing to avoid getting kicked in the balls or getting hurt in the balls if possible because it is really painful