Based on the novel by Rafael Azcona, screenplay by Azcona and Marco Ferreri. Comedy about a young man, Rodolfo, who can't find a flat, so he marries his elderly landlady to inherit her tenancy when she dies.

Review: (from New York Times)
A Home That Was Far From Sweet
By STEPHEN HOLDEN
Published: November 26, 1993

“Perhaps the most fascinating component of the films directed by Orson Welles was the masterpiece he never lived to complete. Beginning in 1957 and continuing on-and-off for the next 15 years, Welles self-financed and directed an audacious film version of Cervantes' "Don Quixote" which brought the legendary knight and his rotund aide Sancho Panza out of 16th century Andalusia and into the world of (then-) modern Spain. But despite his genius behind the camera, Welles was remarkably neglectful in maintaining and preserving the footage he created and much of his work was considered lost...and the footage that remained was not properly stored! However, throughout the 1980s and early 1990s the Spanish filmmakers Jess Franco (who served as Welles' second unit director on Chimes at Midnight) and Patxi Irigoyen tracked down nearly all of the surviving footage, finished the incomplete soundtrack based on Welles' notes, restored the footage where they could and offered a reconstructed Don Quixote de Orson Welles in 1992...” – Phil Hall, Filmthreat.com

Couldn't find any synopsis in english.

Julieta y Pierre forman una pareja cuyo matrimonio va tan a la deriva como el de Mario y Silvia. Son muy amigos y a veces cenan juntos.Como consecuencia Mario se enamora de Julieta y Pierre de Silvia. Silvia está loca por tener un abrigo de visón y Pierre, como es su amante, se lo compra. Silvia lo esconde, para que Mario no se entere, pero éste, que es un truhán, lo descubre, se lo quita y se lo regala a su amante Julieta. Esto produce situaciones de enredo y vodevil, divertidas y eróticas.
Una de las más famosas comedias eróticas de la última etapa del director y productor Ignacio F. Iquino, que funcionó muy bien en taquilla. El conocido tema del intercambio de parejas cruzado con toques de enredo y vodevil, con Eva Lyberten, una de las actrices abanderadas del cine pseudoerótico de finales de los años 70.