If they're harassing other employees they could very well be doing worse, I think.

There is NO reason to put up with crap (unless you either like it or are desperate). Document, and complain to those higher up the food chain. If the harasser is the top dog, document, say no (over and over and over) and see a lawyer.

This past year my niece had enough "inappropriate touching" and complained about the college prof. Investigation showed that she was not only correct, but the eighth student to file such a complaint. He didn't return for the second semester -- a tenured professor dismissed "for cause."

How about a company where the boss takes everyone on a chartered cruise? And when you come to dinner, you're grabbed and vodka is poured into you (literally)? A contractor, he was also depositing the checks given to homeowners by mortgage companies into his own account. When this was discovered, not only did his company go down, but so did a (small) local bank, a class action suit was filed so that people could keep their homes, and more than a few similar things.

I don't like lawsuits, but sometimes that's the only way to get their attention.