It seems you're referring to (also known as Amore e... Peccato Veniale or The Easiest Sin ), the 1974 Italian comedy directed by Salvatore Samperi, starring Laura Antonelli and Alessandro Momo.
For fans of directors like Bernardo Bertolucci ( The Dreamers ) or Louis Malle ( Murmur of the Heart ), Peccato Veniale Uncut is an essential, forgotten gem. It captures a specific moment in Italian history when sex was the last private rebellion against a collapsing society.
The term typically implies a version restored to its original length, often restoring scenes trimmed for censorship — especially relevant for a film that famously explored a young man's sexual awakening through the lens of his older brother's beautiful wife (Laura Antonelli).