Bellas de noche (in English Beauties by Night), also known as Las ficheras, is a Mexican film directed by Miguel M. Delgado.
The Boxer Germán Bronco Torres (Jorge Rivero) loses his license, and works as bouncer at the cabaret El Pirulí (The Lollipop), where he falls for the fichera Carmen (Sasha Montenegro), and befriends the pimp Margarito Fuensanta 'El Vaselinas' (Eduardo de la Peña), who lost a bet and has to pay it to some gangsters.
For 500 pesos for 'El Vaselinas', 'Bronco' prepares a trap in the cabaret to the taxi driver Raul (Enrique Novi), to seduce his girlfriend, not knowing that the victim is his own sister Lupita (Leticia Perdigón).
The Mexican Government censorship prohibited the previous title of the film (Fichera is a derogatory way of calling a cabaret woman in Mexico).
Therefore, as a "tribute" to Luis Buñuel, the screenwriter Victor Manuel Castro took the title of the film Belle de Jour.