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Herederos (Série télévisée 2007–2009) - IMDb

Herederos - Serie de género dramático en RTVE Play

Watch Herederos - Free TV Shows | Tubi (tubitv.com)

It's in Spanish I didn't understand everything

The series begins with a family gathering where we see Rafael García (Helio Pedregal) watching a guest Julia Orozco (Mar Regueras) the wife of Bernardo Sánchez (Ginés García Millán) then the two go away to an isolated place we understand that they are lovers. Just when they start kissing they are interrupted by the maid.

The two are then summoned by an old woman (Concha Velasco) I don't know if she's Rafael García's wife (they're almost the same age) in short she confronts them and tells them that she knows and she invites her to live with them from what I understood she has no children and want the two to give her one as we are in an ancient Spain it is done in the old way.

Then throughout season 1 Julia and Rafael will do this with the consent of the husband! We will learn later that this couple planned this from the beginning to inherit the old couple's fortune.

Season two is not very interesting since it focuses on the baby

In season three and the last Julia feels neglected and she cheats on her husband with a photographer. (She runs a photographic agency) at first she rejected his advances reminding him that she is married and above all she is his boss but in the end she ends up naked in the bathtub with him!

In my opinion, this is the first time where she really cheated on her husband because in the first season she slept with the old man out of interest

In the last episode the husband tries to get her back unfortunately for him this time she chose to remain faithful to her lover (Don't feel sorry for him he didn't stop cheating on her throughout this season with a brunette Mónica (Irene Montalà) besides there is a scene in this season where Mónica tries to blackmail him and he forces her to have sex with him in standing doggystyle)

for those who can't watch the series on Tubi
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https://www.imdb.com/title/tt0129922/

This movie is known by two titles First Degree and Charades 

Watch First Degree (1998) - Free Movies | Tubi (tubitv.com)

A bunch of friends met up for a barbecue in a big house in L.A. They all have something in their past and/or are screwed-up. Arguments, fights, murders and some sex occur in this talky drama that very slowly connects together.

As mentioned in the synopsis, 2 couples meet around a barbecue and a single guest Barry (Jack Scalia) is the one who interests us because the movie revolves around him and it is him that one of the wives cheats on her husband with The wife in question is Laura (Kimberley Kates) first of all at 08:00 minutes while she talks with barry we have a flashback where she cheats on her husband Quinn (James Wilder) at the office I don't know if it's his colleague or his boss (This shows that he was cuckolded long before) her husband surprises her at 00:09:20. Then later in the movie around 00:34:12 barry gets injured (a little wound is just an excuse) and Laura is asked to accompany him to treat him then a series of scenes where the husband discusses with the guests and his wife makes love with Barry.
Frankly, this movie is worth watching if someone more experienced wants to review it. It would be great I am surprised that this movie is not featured on the home page. maybe someone already mentioned it and I haven't seen it.