Cal. Civ. Code § 51.9
(a) A person is liable in a cause of action for sexual harassment under this section when the plaintiff proves all of the following elements:
(1) There is a business, service, or professional relationship between the plaintiff and defendant or the defendant holds himself or herself out as being able to help the plaintiff establish a business, service, or professional relationship with the defendant or a third party. Such a relationship may exist between a plaintiff and a person, including, but not limited to, any of the following persons: