This is an interesting and at the same time particularly important question!!
Most of the comments show that the sharing of wives is a positive experience, while the minority opinion is that it had a negative effect on the marriage.
Open eroticism has become the sexual event that makes their lives happier for those who are basically prepared for the possible consequences or are basically fatalists.
Those couples who show an interest and curiosity in the direction of open sexuality for their own interest should do better if they study together the related sexual psychology studies, which can usually be found on the pages of swinger clubs!!
The psychological guide to the swinger lifestyle highlights the fact that during IR and non-IR based hetero/homo/bisex partner exchange/partner sharing, the person who, after many years, will experience a different partner through another partner, will encounter a lot of new things. the possible pleasures of sex.
Absolutely everything will be new! New personality traits, new physical parameters, new colors, new shapes, new scents, new sexual movement culture, but at least there is a high chance for all of this, and this gradually or suddenly, but they can change the person participating in the sexual act in days, weeks, months, years, because basically everything changes and desires and personalities are no exception!!
Regarding this future, the two people making up the married couple must communicate with each other on a regular basis, because it must become clear how far the marriage can last despite the possible positive experiences and impressions!
Those who are not willing to do this due to laziness or excessive self-confidence will certainly be in for unpleasant surprises, and their marriage may be destroyed in a short time!!
Example:
There is a middle-class couple in their 40s with a house in a garden city with two cars and two half-grown big children, who show the outside world the image of a harmonious, happy family. The reality is that the husband is a power-obsessed person who also uses his wife to fully satisfy his desires, and the wife has to bear this because of their social status and socialization, while the wife has not been able to experience the romantic feelings" for many years high-quality sex, because the husband selfishly thinks only of himself. One day, the husband tells his wife that their sex life will be expanded with something new, and this will take place this weekend. The submissive wife only faces the ready facts when she learns in a discreet motel room that a threesome and cuckold sex will take place in the company of a man who was arranged by her husband for the "seance".
Physically, the man essentially matches the physical parameters of his husband in terms of height, muscle, penis size, except that his character is different, and this is able to calm the wife, who is scared (but does not dare to object) due to the situation, and attracts her attention at the same time.
He is already much more polite than the husband when introducing himself, and this creates the primary emotional impression created at this time with a positive sign in the wife. His voice is soothing. She speaks more slowly than her husband, her voice is deeper, her eyes radiate confident calmness.
His touch is both strong and yet pleasantly caressing. He praises the lady's dress, the beauty of her face, the erotic appeal of her figure, which further strengthens the pleasant feeling in the wife. The husband essentially instructs his wife to have sex with a man she has not known until now without a condom, so that the husband will watch and videotape it. Despite the fact that all this happens against the will of the wife (in essence, the husband made his own wife a sex slave), the wife does not feel in danger and humiliated in the company of the unknown man, because that man directly and/or indirectly makes a good impression with his gestures and words. arose in the lady, due to which, after a while, she not only obeys the husband's rough and current partner's more subtle instructions, but she herself wants to continue the sexual act.
The partner was so tactful that the lady experienced the sex as a caressing delicate romantic lovemaking, for which she did not feel guilty, since even if on instructions, but according to her upbringing, she committed adultery, which is a crime according to the conservative value system. She endured her husband's rude words and gestures in a threesome, but the other man remained moderately dominant and a romantic lover at the same time.
After the husband saw that his wife remained humble, he believed that he could organize the "care of body culture" from time to time, with which he did his wife and lover a favor without knowing it, since at the time of saying goodbye, due to the experience he had in the wife a very strong positive emotional reaction was formed and conserved towards the other man and he believed that it was mutual. The wife wanted to relive this experience, which for her could be called the "seventh heaven", so she humbly asked her husband that if he wanted to have sex again, this man should be his partner again.
On each new occasion, the wife verbally and gesturally indicated to the man that she was more and more attracted to him in the romantic field, and she gave evidence of this in sex as well, so that the husband did not reveal anything. The partner accepted and reciprocated these signs, thereby strengthening the wife's faith. The wife believed that perhaps she had found the man of her dreams in the emotional and sexual sphere, and she already wanted more from this secretly organized relationship, which she indicated to her partner with the utmost discretion so that her husband could not find out about it. These two people have started to become independent and have already reached the point where they could even become independent from their husband. First in the sexual field, and then with the desire for an open dissolution of the marriage.
This was a made-up story, but many similar things can happen if there is no good quality communication regarding the topic and/or if one party does not respect their spouse enough!