Never read or heard about mumps and sterile. Gotta ask, you have a link for that accusation? Regarding our past President?
After raping Juanita Broadderick, Bill Clinton reassured her she could not become pregnant from him as he had had mumps as a young boy and was sterile.
He told her she could keep the swelling on her face down (after punching her) by putting ice on it.
PARAGRAPH FOUR:
http://www.theguardian.com/world/1999/feb/20/clinton.usa
But it has been covered in very MANY other places.
Also HERE in paragraph one:
Also HERE in paragraph three:
https://en.wikipedia.org/wiki/Juanita_Broaddrick
That guy and wife were really scared, and I lost touch with them so don't know how things turned out.
Googled - consensus is usually doesn't cause sterility but can cause difficulty fathering a child, doesn't say it will, always, etc.