Erotic Drama / Psychological Thriller / Giallo-influenced
The Lickerish Quartet (1970), Basic Instinct (1992), or The Night Porter (1974) — but rawer and less polished.
Strong sexual content, nudity, violence, and psychological distress. For adults only.
The Dark Side of Love dives into a twisted web of obsession, betrayal, and desire. When a handsome but enigmatic stranger enters the lives of a wealthy, bored couple, their already fragile marriage spirals into jealousy-fueled madness. What begins as a game of seduction quickly turns into a nightmare of psychological manipulation, voyeurism, and violent passion.
(Uncredited or pseudonym – typical for low-budget ‘80s Italian films)
Here’s a short write-up for The Dark Side of Love (1984), suitable for a site like Ok.ru (often used for rare, cult, or obscure films). The Dark Side of Love (1984) – Italian Erotic Thriller