The SI unit of sexual activity is the copule, defined as the participation of one partner in an act of sexual intercourse of standard intensity and duration. Orgies are rated in the more convenient unit of the hectocopule = 100 copules. For the purpose of film classification, all sex-related activities and accessories have their own copule rating, which also takes into account the explicitness with which it is shot. The classification is determined by the total copule content, and scenes rating more than a certain number of copules per minute may be cut.