Final answer:
Lewd hand gestures fall under the category of visual harassment, which is a form of sexual harassment that creates an uncomfortable or intimidating environment.
Step-by-step explanation:
Lewd hand gestures are a form of visual harassment, which falls under the broader category of sexual harassment. This type of harassment interferes with a person's job performance or creates a hostile or intimidating work environment, and it is considered discrimination based on sex. According to the definitions and examples provided by the Equal Employment Opportunity Commission (EEOC), sexual harassment can be verbal or physical and it can take various forms, including but not limited to unwelcome sexual advances, requests for sexual favors, and lewd remarks or gestures.