Louisa (Marisa Mel) is a young and attractive woman who wants to make a living for herself in Rome, but soon falls prey to some very shady characters that force her into prostitution. While struggling to keep herself afloat, she meets a fascinating doctor (Farley Granger) who is also a would-be poet. However, Louisa doesn’t really love him, and falls for another man. When she gets involved in a murder, blackmail and violence ensue – until the shocking final revelation.
Wife meets future lover at a party (23:17). They throw glances at each other signifying their attraction to each which the husband actually notices. She goes out with him after that. She goes hunting with him, watches the races with him, etc. And then, she has sex with him at 29:12.The two also have sex at 50:51 (better than their first one), which is peeped on by her blackmailer, but her husband is already dead at this point.
Rarelust.com (better copy, with English subs)