Mumps does not cause male sterility. That is propaganda intended to scare people to get vaccinated. 

I have been vaccinated. Even for trips abroad. Had my fair share of jabs in the arm and oral equivalents. But none work. The adaptive human immune system doesn't flinch over subcutaneous injections that happen to include a deactivated pathogen, and deactivated ingredients is quazi-homeopathy.  

You put your faith in false experts that have no tangible idea what they're talking about. How the human immune system works eludes the brightest microbiologists, who are way more scientifically knowledgeable than average MDs. 

In fact, much discovery in immunology is by students chancing upon decades old papers collecting dust and rejuvenating their findings. You have no idea what vaccines are and how interface with the human species, else you would have a Nobel.