A refugee washes up naked in a suitcase on the bank of the Thames. The enigmatic, sexually fluid stranger introduces himself to a bourgeois, upper class family. He is invited to stay on as an employee. The Visitor soon seduces each member of the family in a series of explicit sexual encounters. He will turn their world upside down as they are able to redefine themselves in new, radical ways.
Also possibly grotesque and explicitly pornographic.
Just use the standard Gaspar Noé disclaimer form.