Prostitution is an agreement between consenting people to provide any sexual activity in exchange for money , and any act in furtherance of such agreement. The act in furtherance can be any step taken toward a sexual act. Whether sex occurs or not, is not essential to establish the crime.
California law encourages an arrest on all calls where allegations of Domestic Violence are reported. An arrest for Domestic Violence can even be based on a complaint to the authorities of the simple use of rude force on the person of a spouse, domestic partner, dating partner, or child.