The Rough and the Smooth (U.S. title: Portrait of a Sinner) is a 1959 British drama film directed by Robert Siodmak and starring Nadja Tiller, Tony Britton, William Bendix and Natasha Parry.

[2] In late 1950s London, an upper-class archaeologist, Mike Thompson, has trouble getting a taxi, so asks to share one already on hire to a beautiful German woman, Ila Hansen, and although wary she eventually agrees.

When by chance he sees her again later, they embark on a torrid love affair which threatens to ruin his long-term relationship with his fiancée, Margaret Goreham, and his career prospects dependent upon her rich, titled uncle.

The script is never even on nodding terms with life, and tries to make up for this deficiency by a candidly explosive vocabulary which gives the production a weirdly old-fashioned air.

"[4] Variety wrote: "Aiming to offer the kind of torrid, adult love scene that helped make Room At The Top such a success not only at home but in the U.S, The Rough And The Smooth is a story of passion and betrayal.