A complainant is a nicety and makes things easier but isn't a necessity. Picture this: Enamored Eel has his face smashed in by Pou Pou and reports to the police with nose spread across his face, no front teeth and jaw hanging down near his bellybutton. Pou Pou gets charged. Next day, Enamoured Eel decides not to press charges. You can bet your arse Pou still has a day in front of the beak. Nobody, yet knows the nature of Dildo Brown's advances. If they are serious enough and of a sexual nature don't be surprised that if there is enough evidence without an unwilling complainant, the young fella will also have an appointment with the beak.