Its funny how these days, the more overtly romantic a game title is, the more certain you can be that its NTR- "My Girlfriend", "My Lovely Relationship", "The Perfect Couple,", "The One True Love of My Life Who Will Never Ever Cheat on Me", etc
Modern times, modern kinks. Now the sharing of the wife or the GF is fashionable.
Bur I remember italian movies in the '80 where the theme was widely told:
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LA CHIAVE (The key);
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COSI' FAN TUTTE (All Ladies do it)
expecially All Ladies do it has a plot very modern:
Diana is a wife happily married to sympathetic Paolo but she is keen on playing benign games of seduction with other men while resisting the advances of chic lingerie shop owner Silvio (Renzo Rinaldi) and she narrates her adventures to Paolo in order to stimulate their otherwise monotonous sexual life. However, under the influence of her lesbian friend Antonietta and raunchy sister Nadia, Diana starts to move the ongoings further while Paolo is still prone to believing that events narrated by her are merely fantasies. Nevertheless, when the French Sadean antiques dealer Donatien Alphonse (Franco Branciaroli) leaves marks on her body, Paolo understands that Diana is cheating on him and throws her out of the house. Diana then seeks further sexual adventures, while she and Paolo reflect on the nature of sexuality and monogamy, and their future as a couple.
In November 2020, the Indian adaptation starring Sejal Shah released on Nuefliks OTT platform. The film was directed by Akhil Gautam.