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I saw the post from Trieste that encouraged me to look for the identification of a softcore film.

Now, I saw that one around 1993 on Turkish television. It was heavily cut and it may also be the softcore release of a hardcore film. Given the bad translation of films on Turkish TV networks, I might have failed to catch some details in dialogues. The film made large use of sepia colours, yet retaining a somewhat amateurish look. It is most possibly from early 1990s and its origin may be Italian or a more unexpected one.

A French girl arrives at a wealthy Far Eastern house to work as a maid. The family members are wearing Chinese clothing but they look explicitly Western. My assumption is that they are supposed to be a Eurasian trading dynasty from colonial Indochina. On the contrary, the girl has more distinctively Asian looks, somewhat resembling B?atrice Valle but younger and more perky. The plot is the classical 'everyone-fucks-everyone' thing but there are some significant deviations from the conventional line. The son is a shy young man playing the 'bottom' in a homosexual relationship with a skinny, Filipino-looking macho guy. The macho gets interested in the girl and fucks her. Then, he, the son, and the girl go for a threesome. French girl inevitably has sex also with the father and the mother while the grandfather who has the features of an English aristocrat is constantly sitting on his chair and making philosophy about the virtues of the Orient. Eventually, the girl falls in love with grandpa.

Thanks in advance for any help.

I don't know you are not posting this to the Trieste thread.
In any event what Trieste saw was a movie apparently on late night (weekend?) TV program that broadcast "spicy" erotic movies of euro-american origin.
I would wager (and we are talking early 1990's) that it would not be an originally hard core movie with censored scenes to make it into a passable softcore product. There would not have been much need for that. There was plenty of soft-core material at the time (and dubbed into french) to make the purchase of such programming soft-core and not to go shopping around for problematic hard-core product.