Cannon v. United States, 116 U.S. 55 (1885), was a United States Supreme Court case in which the Court held compacts for sexual non-intercourse, easily made and easily broken, when the prior marriage relations continue to exist, with the occupation of the same house and table and the keeping up of the same family unity, is not a lawful substitute for the monogamous family which alone the statute tolerates.^[1]