Mama, There's A Man in Your Bed (1989)
Mama, There's A Man in Your Bed is a 1989 light French comedy built around an interracial romance. Its French title is Romuald et Juliette (also the title of its British DVD release). The film was directed by Coline Serreau, of Three Men and a Cradle fame and stars Daniel Auteuil and Firmine Richard.
More at Wikipedia.