People have been sued for "leering" and "brushing up against." Doesn't really matter whether they won or lost. Attorneys' fees will eat you alive either way.
IAAL, and I'm imagining the deposition in a hypothetical (inevitable?) sexual harassment suit. Q: Were you, as a supervisor, aware of any sexual harassment at the workplace? A: No. Q: Did you have a "sexual harassment jar"? A: Yes. Q: And what was the purpose of the sexual harassment jar? A: To curb employee sexual harassment. Every time someone said something that could be sexual or suggestive, they'd have to put a dollar in the jar. Q: And how much money was eventually contributed to the jar? A: The last time I cleaned it out, it had $562. Q: So let me ask you again, were you aware of any sexual harassment at the workplace?