No, it's getting quite common. The pence rule, they call it in America.

I've been on the pointy end of a false accusation by a woman in my team who was upset I insisted on supervising and double checking her work (which was extremely poor). Lucky me, the accusation wasn't sexual and double lucky she was a terrible liar. But if you think false accusations are rare you are pretty naive and probably just were never in a position to make an enemy of a woman.